BigArrowHome & Tiggy Fuel

Complete User Guide for Paragliders & Light Aircraft Pilots

Android Phone/Tablet & Wear OS Watch

Part One

Android Application — BigArrowHome

1. Getting Started

Installation

BigArrowHome is a full-screen navigation and flight monitoring app designed for paraglider and light aircraft pilots. It runs on any Android phone or tablet with Android 8.0 (Oreo) or later.

  1. Install the app from the Google Play Store or your provided APK file.
  2. Grant permissions when prompted — location, Bluetooth, and optionally SMS/Call for SOS.
  3. Allow location access — select "Allow all the time" for the most reliable GPS tracking.
  4. Set your HOME location at your launch site before your first flight.

First Flight Checklist

  • Set HOME at your launch site
  • Add destinations/landing zones with their ground elevations
  • Configure your SOS emergency contacts
  • Check your altitude unit preference (metres or feet)
  • Set your glide ratio to match your aircraft
  • Join a group if flying with others

2. Main Screen

The main screen is a full-screen navigation display locked to portrait orientation. The map occupies the entire background with flight instruments overlaid on top.

Screen Layout

Top-Left
Altitude & Wind Indicator
Top-Right
Target Info & Traffic Light
Floating (Draggable)
Fuel Panel
Centre
Interactive Map
Centre Overlay
Direction Circle
Bottom
Quick Action Buttons

Bottom Quick Action Bar

Five buttons provide one-tap access to the most common actions:

Button Function
HOME Save your current GPS position and elevation as the Home point (launch site reference for AGL altitude and Glide Range).
WAYPOINT Enter waypoint placement mode — tap anywhere on the map to drop a navigation waypoint.
DEST Enter destination placement mode — tap the map, then enter a name and the ground elevation of the landing zone.
WIND Start circle wind measurement. Fly a full 360° turn to calculate wind speed and direction.
GLIDE Toggle the emergency glide range ring on or off.

Additional Buttons

Menu (top-left)
Opens the main menu with all features
Recenter (bottom-left)
Snaps the map back to your GPS position and re-enables auto-follow. Appears only when you manually pan the map.
SOS (bottom-right, red)
Sends your location to all configured emergency contacts

3. Map & Navigation Features

Map Types

Three map styles are available, changeable in Settings:

Map Type Source Best For
Standard OpenStreetMap General navigation, identifying roads and landmarks
Satellite ESRI World Imagery Visual identification of landing zones and terrain
Terrain OpenTopoMap Mountain flying, contour lines and elevation awareness

Map Orientation

North Up
Map stays fixed with north at the top. Traditional compass orientation.
Track Up
Map rotates so your direction of travel always points upward. Easier for intuitive navigation.

Position Marker

Your position on the map is shown with a rotating icon that matches your current heading. Three styles are available in Settings:

  • Arrow — Simple directional indicator (default)
  • Paraglider — For paraglider pilots
  • Plane — For fixed-wing aircraft

If Speed Bubbles are enabled in Settings, a small white label showing your speed in km/h appears beside the marker.

Track Line

A blue polyline traces your flight path on the map, recording every GPS update. Toggle on/off in Settings. Clear from the Menu with "Clear Track Line".

Laser Line

A red line extends from your aircraft icon in the direction you are currently travelling, helping you visualise your projected flight path. Toggle on/off in Settings.

Map Controls

  • Pinch to zoom — Two-finger gesture to zoom in or out.
  • Drag to pan — Slide one finger to move around the map.
  • Double-tap — Quick zoom in.
  • Auto-follow — Automatically disabled when you manually pan. Tap the Recenter button to re-enable.

4. Waypoints & Destinations

Navigation Point Types

Type Icon Purpose
HOME Your launch site. Used as the elevation reference for AGL altitude and as the centre for Glide Range calculations.
WAYPOINT Intermediate navigation points along your route. No elevation data required.
DESTINATION Landing zones with a known ground elevation. Required for VASI glide slope calculations.

Adding Navigation Points

Setting HOME

  1. Go to your launch site and wait for a good GPS fix.
  2. Tap the HOME button.
  3. Your current coordinates and altitude are saved immediately.

Adding Waypoints

  1. Tap the WAYPOINT button.
  2. Tap anywhere on the map to place the waypoint.
  3. The waypoint is saved and appears as a marker.

Adding Destinations

  1. Tap the DEST button.
  2. Tap the landing zone on the map.
  3. A dialog appears — enter the destination name and its ground elevation in metres or feet.
  4. The destination is saved and automatically becomes your active navigation target.

Ground Elevation Matters

Entering an accurate ground elevation for destinations is essential. The VASI approach guidance and glide calculations rely on this value to determine whether you can safely reach the landing zone.

Search by Postcode

  1. Open Menu and select "Search by Postcode".
  2. Enter a UK postcode, address, or place name.
  3. The app searches via OpenStreetMap (Nominatim) and displays the result.
  4. The map pans to the found location.
  5. Optionally set it as a destination (you will be prompted for a name and ground elevation).

Managing Points

Open "Manage Waypoints" or "Manage Destinations" from the Menu to:

  • View all saved points with their names and coordinates.
  • Tap the navigation icon to set any point as your active target.
  • Tap the delete icon to remove a point.

5. Altitude Tracking

Altitude Display

The altitude readout in the top-left corner of the main screen shows your current height in real time.

Altitude Modes

Tap the altitude display to toggle between modes:

Mode Description Use Case
GPS (MSL) Altitude above Mean Sea Level as reported by GPS. Standard reference matching aviation charts.
AGL Height above your Home point elevation. Calculated as: GPS Altitude − Home Elevation. Knowing your height above the launch site or landing zone.

Important

AGL mode requires HOME to be set first. GPS altitude can vary by ±10–30 metres — this is a normal limitation of consumer GPS. Allow 1–2 minutes after launch for the reading to stabilise.

Altitude Units

Choose between Metres and Feet in Settings. This applies everywhere altitude is displayed, including SOS messages.

6. Wind Measurement

Circle Wind Measurement

BigArrowHome calculates wind speed and direction by analysing your ground speed in different compass sectors as you fly a circular turn.

How to Measure Wind

  1. Tap the WIND button to activate measurement mode.
  2. Fly a complete 360° circle in either direction at a steady speed.
  3. A progress indicator shows "STOP X%" as you accumulate heading change.
  4. When a full 360° is detected, the measurement auto-completes.
  5. The calculated wind speed and direction appear in the top-left wind indicator.

Wind Display

After measurement, the top-left panel shows:

  • Wind Speed — in m/s
  • Wind Arrow — rotates to show wind direction
  • Validity Indicator — colour-coded dot

Wind Data Validity

Colour Meaning
Green Measured within 5 km of your current position and less than 30 minutes ago. Data is trusted.
Orange Data is stale (older than 30 minutes) or was measured more than 5 km away. Consider re-measuring.

Tips for Accurate Wind Measurement

  • Fly a smooth, consistent circle at a steady airspeed.
  • Wind data expires after 30 minutes or 5 km from the measurement location.
  • Clear old data from Menu > "Clear Wind Data".

8. VASI (Visual Approach Slope Indicator)

What is VASI?

VASI simulates the real-world visual approach slope indicator used at airfields. It tells you whether you are on the correct glide slope to reach your landing zone, or whether you are too high or too low.

VASI Display

When you are within 5 km of an active destination, four coloured lights appear at the bottom-centre of the screen:

Status Meaning Action
ON GLIDE You are on the correct glide slope. Maintain current descent rate.
TOO HIGH You are above the ideal glide path and will overshoot. Increase descent or extend your approach.
TOO LOW You are below the ideal glide path and may not reach the landing zone. Gain altitude or shorten your approach.
BELOW TARGET You are below the destination's ground elevation. You cannot reach this destination at your current altitude.

How VASI is Calculated

The system compares the glide slope you need (based on your height above the destination and your horizontal distance to it) against your aircraft's configured glide ratio. It uses:

  • Your current GPS altitude
  • The destination's ground elevation (entered when you created the destination)
  • Your horizontal distance to the destination
  • Your configured glide ratio (set in Settings)

Glide Ratio Setting

Set your aircraft's glide ratio in Settings (range: 3:1 to 30:1, default: 8:1):

  • Paragliders: Typically 8:1 to 10:1
  • Hang gliders: Typically 12:1 to 15:1
  • Sailplanes: 20:1 to 30:1 or higher

VASI Requirements

  • Navigation to a destination must be active (tap the destination marker).
  • You must be within 5 km of the destination.
  • The destination must have a ground elevation entered.
  • VASI must be enabled in Settings.

9. Emergency Glide Range

What is Glide Range?

The glide range feature displays a circular ring on the map showing the maximum distance you can glide from your current position. Any landing zone within the ring is theoretically reachable in still air.

How to Use

  1. Ensure HOME is set (provides the ground elevation reference).
  2. Tap the GLIDE button.
  3. A coloured ring appears on the map centred on your position.
  4. The ring updates in real time as your altitude changes.
  5. Tap GLIDE again to turn it off.

Understanding the Ring

The radius is calculated as:

(Your Altitude − Home Elevation) × Glide Ratio = Maximum Glide Distance

Example: At 500 m AGL with an 8:1 glide ratio = 4 km radius.

Safety Note

The glide range is calculated in still air. Wind, sink, turbulence, and terrain obstacles are NOT accounted for. Always maintain a safety margin and have alternative landing options.

10. Fuel Management

Connection Methods

The phone can receive fuel data from the Tiggy Fuel sensor in two ways:

Method Connection Screen Label
Direct BLE Phone connects directly to the Tiggy Fuel sensor over Bluetooth Low Energy. This is the preferred method. FUEL (BLE)
Via Wear OS Watch The Tiggy Fuel watch app relays sensor data to the phone via the Google Wearable Data Layer. FUEL (Watch)

Direct BLE takes priority if both sources are available.

Fuel Panel

When connected, a draggable fuel panel appears on screen displaying:

  • Tank Percentage — large, colour-coded text
  • Litres Remaining — calculated volume
  • Progress Bar — visual fuel level
  • Estimated Runtime — time remaining at current flow rate
  • Flow Rate — current consumption in L/min
  • Pressure — fuel system pressure in kPa
  • Battery Voltage — sensor power supply in Volts

You can drag the fuel panel to any position on the screen.

Fuel Colour Coding

Colour Meaning
White Fuel level is normal.
Orange Fuel has dropped to or below the low fuel alert threshold (default 20%).
Red Fuel has dropped to half the alert threshold — critically low.

Low Fuel Alert

When fuel drops below the configured threshold:

  • The phone vibrates.
  • An audible alarm sounds.
  • A red flash appears on screen.
  • The alert triggers once and resets when fuel rises above the threshold (e.g. after refuelling).

Fuel Sensor Settings

Access via Menu > Fuel Sensor Settings:

Setting Description
Tank Capacity Your fuel tank size in litres. Sent to the sensor and used for all calculations. Default: 50 L.
Flow Mode Linear (standard), High (increased sensitivity for low flow), or Low (reduced sensitivity for noisy high-flow systems).
Use Flow for Tank Level Off: tank level comes from the pressure sensor. On: calculated as Tank Capacity − Total Litres Consumed. Use this if the pressure reading fluctuates.
Low Fuel Alert Threshold The percentage at which the alert triggers. Adjustable from 1% to 50%. Default: 20%.
Set Empty Point Calibrates the sensor when the tank is completely empty. Establishes the zero-fuel pressure baseline.
Set Full Point Calibrates the sensor when the tank is completely full. Establishes the full-tank pressure baseline.
Reset Total Flow (Refill) Resets the cumulative fuel consumption counter to zero. Press after every refuel if using the flow-based tank level method.

11. Group Flying

What is Group Flying?

Group Flying allows multiple pilots to see each other's real-time positions on the map. It uses Firebase in the background — no separate account or login is needed.

Setting Up a Group

Every member of the group must configure three identical values:

  1. Open Menu > "Group Settings".
  2. Enter your Display Name — how others see you on the map. Only the first 3 characters are shown on markers.
  3. Enter the Group Name — all members must use the exact same name (case-sensitive).
  4. Enter the Group Code — a shared password. All members must use the exact same code.
  5. Save. Your location is now shared automatically whenever the app is running.

Security

Only pilots with the exact same Group Name AND Group Code can see each other. Share these credentials only with your flying companions.

Viewing Group Members

Other pilots in your group appear as markers on the map. Each marker shows:

  • Name — abbreviated to the first 3 characters.
  • Speed — current speed in km/h.
  • Fuel Percentage — if the member has a fuel sensor connected.

Members who have not updated their position within the last 2 minutes are automatically hidden from the map.

Connection Status

Status Meaning
Green Connected and actively sharing location with the group.
Orange Group is configured but you are currently offline.
Grey No group configured.

Leaving a Group

Press "Leave Group" in the Group Settings dialog. This immediately stops location sharing, removes you from other members' maps, and clears the group settings from your device.

Requirements

  • All group members must have an active internet connection.
  • All members must use the exact same Group Name and Group Code (case-sensitive).

12. SOS Emergency System

Emergency Feature

The SOS system sends your GPS location to emergency contacts when you need help. Set up your contacts BEFORE you fly.

Setting Up Emergency Contacts

  1. Open Menu > "SOS Contacts".
  2. Tap "Add Contact".
  3. Enter the contact's Name and Phone Number.
  4. Choose one or more notification methods:
    • Send SMS — sends a text message with your location.
    • Make Call — places a phone call.
    • Both — sends SMS and calls.
  5. Repeat for additional contacts. You can add as many as needed.

Triggering an SOS

  1. Press the red SOS button in the bottom-right corner.
  2. A confirmation dialog appears showing how many contacts will be alerted.
  3. Confirm to send. SMS messages are dispatched and calls are placed in sequence.

SOS Message Content

Each contact configured for SMS receives:

EMERGENCY! I need help!

https://maps.google.com/?q=51.5074,-0.1278

Altitude: 1,250 ft

The Google Maps link allows your contacts to see your exact location immediately on any device.

Required Permissions

  • SEND_SMS — to send emergency text messages.
  • CALL_PHONE — to make emergency phone calls.

The app will request these permissions when you first attempt to send an SOS.

13. Settings & Preferences

Access via Menu > Settings. All settings are saved automatically and persist across app restarts.

Display Settings

Setting Options Description
Position Icon Arrow / Paraglider / Plane Choose your aircraft icon on the map.
Show Track Line On / Off Display the blue flight path on the map.
Show Laser Line On / Off Display the red projected-heading line.
Show Traffic Light On / Off Display the green/orange/red on-course indicator.
Show VASI Lights On / Off Display approach slope guidance near destinations.
Show Speed Bubbles On / Off Display speed labels on your marker and group member markers.
Auto-Follow GPS On / Off Automatically centre the map on your position.

Altitude Settings

Setting Options Description
Unit Metres / Feet Applies everywhere altitude is displayed.
Mode GPS (MSL) / AGL Can also be toggled by tapping the altitude readout on screen.

Map Settings

Setting Options Description
Map Type Standard / Satellite / Terrain Choose the map tile source.
Map Orientation North Up / Track Up Fixed north or rotate with heading.

Navigation Settings

Setting Range Default Description
Glide Ratio 3:1 to 30:1 8:1 Used for VASI and Glide Range calculations.

Power & Screen Settings

Setting Options Description
Keep Screen On On / Off Prevents the screen from dimming or sleeping during flight. Recommended: On.
Power Save Mode On / Off Reduces GPS update frequency to conserve battery.
Dim Screen On / Off Lowers brightness when power save is active.
GPS Update Interval 10s / 30s / 1 min / 2 min How often GPS position updates in power save mode. Normal mode uses 2-second updates.

15. Permissions

Location & Network

Permission Purpose Required?
ACCESS_FINE_LOCATION High-accuracy GPS tracking for all navigation features. Yes
ACCESS_COARSE_LOCATION Network-based location fallback. Yes
INTERNET Map tile downloads, group flying, and postcode search. Yes
ACCESS_NETWORK_STATE Detect whether an internet connection is available. Yes

Bluetooth (for Fuel Sensor)

Permission Purpose Required?
BLUETOOTH / BLUETOOTH_ADMIN Legacy Bluetooth access (older Android versions). Only if using fuel sensor
BLUETOOTH_SCAN Discover the fuel sensor device (Android 12+). Only if using fuel sensor
BLUETOOTH_CONNECT Communicate with the fuel sensor (Android 12+). Only if using fuel sensor

Emergency Features

Permission Purpose Required?
SEND_SMS Send SOS location messages to emergency contacts. Only if using SOS
CALL_PHONE Make SOS emergency phone calls. Only if using SOS

Permission Tips

  • For best GPS accuracy, select "Allow all the time" for location access.
  • Bluetooth permissions are only needed if you are using the Tiggy Fuel sensor.
  • SMS and Call permissions are only needed if you configure SOS contacts.

Part Two

Wear OS Application — Tiggy Fuel

16. Getting Started (Wear OS)

Installation

Install the Tiggy Fuel app on your Wear OS smartwatch running Android 12 or later (Wear OS 3+). The app is fully standalone and does not require the phone app to be installed, although it can relay data to BigArrowHome on your phone when both apps are present.

Permissions

On first launch, the app requests Bluetooth permissions:

  • Android 12+ watches: BLUETOOTH_SCAN and BLUETOOTH_CONNECT.
  • Older watches: ACCESS_FINE_LOCATION (required by the system for BLE scanning).

Grant these when prompted. The app cannot find or connect to the fuel sensor without them.

Automatic Connection

Once permissions are granted, the app automatically:

  1. Scans for the Tiggy Fuel BLE sensor nearby.
  2. Connects to the sensor when found.
  3. Negotiates an optimal data transfer speed (185-byte MTU).
  4. Begins receiving live telemetry data every 10 seconds.

No manual pairing, button presses, or configuration is required — the app finds and connects to the sensor entirely on its own.

Tip

The sensor must be powered on and within Bluetooth range (typically 10–30 metres). The app will automatically reconnect if the connection is lost and the sensor comes back in range.

17. Dashboard (Main Screen)

The dashboard is the primary screen shown after launch. It uses a pure black background optimised for OLED watch displays and battery efficiency. All content is vertically scrollable — swipe up to reveal additional readings.

Connection Status

At the top of the screen, a status line and LED indicator show the current state:

Status Meaning
Idle App has just launched; connection not yet attempted.
Scanning Searching for the fuel sensor via Bluetooth.
Connecting Sensor found; establishing connection.
Discovering Connected; reading sensor capabilities and services.
Connected Fully operational. Live data streaming.
Error Connection failed. The specific error message is displayed.

The small circular LED indicator beside the status text shows:

  • Green (flashing) — Live data packet just received.
  • Grey — No recent data.

Fuel Level Gauge

The primary instrument is a large circular gauge:

  • Percentage — displayed prominently as "Fuel: XX %".
  • Circular Progress Ring — a green arc fills proportionally from 0% to 100% around a dark grey background.
  • If data is unavailable, "-- %" is shown.

Tank Information

Below the gauge:

  • Tank Capacity — "Tank XX.X L" showing your configured tank size.
  • Remaining Fuel — "(XX.X L Remaining)" in grey text.

Runtime Estimate

Displays the estimated time your fuel will last at the current flow rate:

  • Yellow text — Fuel is actively flowing (engine running). Shows "Runtime: XXh XXm".
  • Grey text — No flow detected (engine idle).

Detailed Telemetry (Scroll Down)

Swipe up on the dashboard to reveal three additional readings, each with a coloured progress bar:

Reading Display Bar Colour Range
Flow Rate "Flow: XX.XX LPM" (litres per minute) Cyan 0–10 LPM
Pressure "Pressure: XX.XX kPa" (kilopascals) Yellow 0–20 kPa
Battery "Batt: X.XX V" (volts) Red 0–5 V

If any reading is unavailable, "--" is displayed in its place.

Setup Button

At the bottom of the scrollable dashboard, tap Setup to open the Settings & Calibration screen.

18. Settings & Calibration (Wear OS)

Tap "Setup" on the dashboard to access this screen. All settings are saved automatically and persist across app restarts.

Tank Capacity

A scroll-wheel picker allows you to select your tank size from 0 to 2001 litres. The default is 20 litres.

  1. Swipe up or down on the picker to select your tank capacity.
  2. Tap Set Tank Capacity to confirm.
  3. The value is saved to the watch and transmitted to the fuel sensor.
  4. A green "Sent!" confirmation appears for 1.5 seconds on success.

Keep Awake

Setting Default Description
Keep Awake Off When enabled, the watch screen stays on permanently and will not dim or sleep. Useful during continuous monitoring.

Use Flow for Tank Level

Setting Default Description
Use Flow for Tank Level Off Off: Tank percentage comes directly from the sensor's pressure reading.
On: Calculated as Tank Capacity − Total Litres Consumed. The result is clamped between 0 and the tank capacity. Use this if the pressure reading fluctuates or is inaccurate.

Flow Mode

Three radio buttons configure the sensor's flow measurement behaviour:

Mode Description
Linear (default) Standard measurement for typical conditions.
High Increased sensitivity for detecting low flow rates.
Low Reduced sensitivity for high-flow or noisy fuel lines.

The selected mode is sent to the sensor immediately and saved locally.

Calibrate Empty Point (Lower)

Tap Lower (Empty) when the fuel tank is completely empty. This sends a calibration command to the sensor, recording the zero-fuel pressure baseline.

  • Success: "Sent!" overlay for 1.5 seconds.
  • Failure: "Not connected!" overlay if the sensor is unreachable.

Calibrate Full Point (Upper)

Tap Upper (Full) when the fuel tank is completely full. This records the full-tank pressure baseline.

  • Success: "Sent!" overlay for 1.5 seconds.
  • Failure: "Not connected!" overlay if the sensor is unreachable.

Reset Total (Refill)

Tap Reset Total (Refill) after refuelling. This resets the cumulative fuel consumption counter to zero. Essential if you are using the "Use Flow for Tank Level" option — without resetting, the remaining fuel calculation will be incorrect after a refuel.

  • Success: "Sent!" overlay for 1.5 seconds.
  • Failure: "Not connected!" overlay if the sensor is unreachable.

Back Button

Returns to the dashboard. All settings are already saved — nothing is lost by navigating away.

Saved Settings Summary

Setting Default Persisted?
Tank Capacity 20 L (picker) / 50 L (stored) Yes
Keep Awake Off Yes
Use Flow for Tank Level Off Yes
Flow Mode Linear Yes

19. Phone Data Sync

The Tiggy Fuel watch app automatically relays all fuel telemetry to the paired Android phone via the Google Wearable Data Layer. This happens in the background with no user action required.

Data Transmitted

Field Description
Tank PercentageCurrent fuel level (0–100%)
Tank LitresRemaining fuel in litres
Tank CapacityConfigured tank size
Flow RateCurrent consumption (L/min)
Total Litres ConsumedCumulative fuel used since last reset
PressureFuel system pressure (kPa)
Battery VoltageSensor power supply (V)
TimestampWhen the reading was taken
Flow StateWhether fuel is currently flowing

The phone app (BigArrowHome) receives this data and displays it in the Fuel Panel on screen, labelled "FUEL (Watch)".

Requirements

  • The watch and phone must be paired via Bluetooth.
  • The BigArrowHome phone app must be installed.
  • No configuration is needed — syncing is automatic and immediate.

20. Connection & Reconnection

Connection Behaviour

  • On launch: The app waits 1 second then automatically scans and connects to the sensor.
  • On resume: If you leave the app and return, it automatically attempts to reconnect if the connection was lost.
  • Out of range: If the sensor moves out of Bluetooth range, the status indicator updates to reflect the disconnection. When the sensor comes back in range, reconnection is attempted automatically.
  • Polling: When connected, the app requests updated telemetry from the sensor every 10 seconds.

Display Formats

All telemetry values use consistent formatting:

Value Format Unavailable
Tank Percentage "45 %" "-- %"
Volume (Litres) "25.5 L" (1 decimal) "-- L"
Flow Rate "3.50 LPM" (2 decimals) "--"
Pressure "12.34 kPa" (2 decimals) "--"
Battery "3.72 V" (2 decimals) "--"

Part Three

Calibration, Workflows & Quick Reference

21. Initial Sensor Calibration

Perform this procedure once when first setting up the Tiggy Fuel sensor, or whenever you change tanks. You can use either the phone app or the watch app — the commands are identical.

  1. Set Tank Capacity — Open Fuel Settings and enter your tank size in litres. Confirm to send the value to the sensor.
  2. Calibrate Empty — With the tank completely empty, press "Set Empty Point" (phone) or "Lower (Empty)" (watch). This records the zero-fuel pressure baseline.
  3. Calibrate Full — Fill the tank completely, then press "Set Full Point" (phone) or "Upper (Full)" (watch). This records the full-tank pressure baseline.
  4. Select Flow Mode — Choose Linear (standard), High (for low flow rates), or Low (for noisy high-flow systems).
  5. Choose Tank Level Method — If the pressure reading is stable, leave "Use Flow for Tank Level" off. If it fluctuates, enable it to use the flow-based calculation instead.

Done

Your sensor is now calibrated. The readings will be accurate as long as the tank and sensor hardware remain unchanged.

22. Pre-Flight Checklist

Before each flight, confirm the following:

# Item Action
1 Fuel Check the fuel panel shows the correct level. If refuelled, press "Reset Total (Refill)" to reset the consumption counter.
2 Home Point Press HOME at your launch site. This enables AGL altitude and Glide Range.
3 Destination If you have a planned landing site, press DEST and place it on the map. Enter the ground elevation for accurate VASI.
4 Waypoints Add any intermediate waypoints for your route.
5 Group If flying with others, confirm all members have the same Group Name and Code, and that the status is green.
6 SOS Contacts Verify your emergency contacts are configured and permissions are granted.
7 Settings Confirm your glide ratio, altitude unit, and map preferences are correct.
8 Screen Enable "Keep Screen On" so the display does not sleep during flight.

23. Quick Reference Card

Android App — Buttons

HOME
Set launch site
WAYPOINT
Add nav point
DEST
Set destination
WIND
Measure wind
GLIDE
Glide range ring
Recenter
Follow GPS
Tap Altitude
Toggle GPS/AGL
SOS
Emergency alert

Wear OS App — Screens

Dashboard
Fuel gauge, runtime, flow, pressure, battery
Setup
Tank capacity, calibration, flow mode, preferences

Traffic Light Quick Guide

On Track (±15°) Off Track (15–45°) Way Off (>45°)

VASI Quick Guide

ON GLIDE = Correct slope TOO HIGH = Above slope TOO LOW = Below slope

Fuel Colour Codes

White = Normal Orange = Low (≤ threshold) Red = Critical (≤ half threshold)

Wind Indicator

Green = Fresh & nearby (<30 min, <5 km) Orange = Stale or distant

Wear OS Telemetry Colours

Green LED = Data received Grey LED = No data Yellow runtime = Engine running Grey runtime = Engine idle

Complete Settings Reference (Android)

SettingOptionsDefault
Position IconArrow / Paraglider / PlaneArrow
Altitude UnitMetres / FeetMetres
Altitude ModeGPS (MSL) / AGLGPS
Map TypeStandard / Satellite / TerrainStandard
Map OrientationNorth Up / Track UpNorth Up
Glide Ratio3:1 to 30:18:1
Show Track LineOn / OffOn
Show Laser LineOn / OffOn
Show Traffic LightOn / OffOn
Show VASI LightsOn / OffOn
Show Speed BubblesOn / OffOff
Auto-Follow GPSOn / OffOn
Keep Screen OnOn / OffOff
Power Save ModeOn / OffOff
Dim ScreenOn / OffOff
GPS Update Interval10s / 30s / 1 min / 2 min30s
Tank CapacityIn litres50 L
Flow ModeLinear / High / LowLinear
Use Flow for Tank LevelOn / OffOff
Low Fuel Alert1% – 50%20%

Complete Settings Reference (Wear OS)

SettingOptionsDefault
Tank Capacity0 – 2001 litres20 L
Keep AwakeOn / OffOff
Use Flow for Tank LevelOn / OffOff
Flow ModeLinear / High / LowLinear

24. Troubleshooting

GPS Issues (Android)

Problem Solution
No GPS signal
  • Ensure location permission is granted ("Allow all the time").
  • Move to an open area with a clear view of the sky.
  • Wait 30–60 seconds for GPS to acquire a fix.
  • Restart the app if needed.
Inaccurate altitude
  • GPS altitude can vary by ±10–30 m. This is a normal GPS limitation.
  • Allow 1–2 minutes after launch for the reading to stabilise.
  • For AGL mode, set Home at a known elevation on level ground.
Position jumps around
  • Check if power save mode is reducing GPS updates.
  • Avoid areas near tall buildings or dense tree cover.

Map Issues (Android)

Problem Solution
Map tiles not loading
  • Check your internet connection.
  • Try a different map type (Standard, Satellite, or Terrain).
  • Clear the app cache in Android Settings > Apps > BigArrowHome.
Map does not follow position
  • Tap the Recenter button (bottom-left).
  • Enable "Auto-Follow GPS" in Settings.

Fuel Sensor Issues (Android & Wear OS)

Problem Solution
Sensor not connecting
  • Ensure Bluetooth is enabled on your device.
  • Check that Bluetooth permissions have been granted.
  • Ensure the sensor is powered on.
  • Move closer — BLE range is typically 10–30 metres.
  • Restart the app to trigger a fresh scan.
Inaccurate fuel readings
  • Recalibrate with "Set Empty" and "Set Full".
  • Verify your tank capacity setting matches the actual tank.
  • Try a different flow mode (Linear, High, or Low).
  • Enable "Use Flow for Tank Level" if the pressure reading is unstable.
Wear OS shows "Not connected!"
  • The sensor may be out of range or powered off.
  • Return to the dashboard — the app auto-reconnects when it resumes.

Fuel Panel Not Appearing on Phone

Problem Solution
No fuel data on phone (via watch)
  • Verify the Tiggy Fuel watch app is running and shows "Connected".
  • Confirm the phone and watch are paired via Bluetooth.
  • Ensure BigArrowHome is installed on the phone.
No fuel data on phone (direct BLE)
  • Open Fuel Sensor Settings from the Menu.
  • Ensure Bluetooth permissions are granted.
  • The app scans automatically — wait a few seconds for connection.

Group Flying Issues

Problem Solution
Cannot see group members
  • Verify the Group Name matches exactly (case-sensitive).
  • Verify the Group Code matches exactly.
  • Ensure all members have an active internet connection.
  • Members are hidden after 2 minutes of inactivity.
"Firebase not configured" error
  • Check your internet connection.
  • Restart the app.

Wind Measurement Issues

Problem Solution
Measurement not completing
  • Ensure you fly a full 360° circle. Watch the progress indicator.
  • Maintain a roughly constant speed during the turn.

VASI Not Showing

Problem Solution
VASI lights not visible
  • Navigation to a destination must be active (tap the destination marker).
  • You must be within 5 km of the destination.
  • The destination must have a ground elevation entered.
  • VASI must be enabled in Settings.

SOS Issues

Problem Solution
SOS not sending
  • Grant SEND_SMS and CALL_PHONE permissions in Android settings.
  • Verify contacts have valid phone numbers.
  • Ensure the device has mobile network coverage.
  • At least one emergency contact must be configured.