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.
Install the app from the Google Play Store or your provided APK file.
Grant permissions when prompted — location, Bluetooth, and optionally SMS/Call for SOS.
Allow location access — select "Allow all the time" for the most reliable GPS tracking.
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
Go to your launch site and wait for a good GPS fix.
Tap the HOME button.
Your current coordinates and altitude are saved immediately.
Adding Waypoints
Tap the WAYPOINT button.
Tap anywhere on the map to place the waypoint.
The waypoint is saved and appears as a marker.
Adding Destinations
Tap the DEST button.
Tap the landing zone on the map.
A dialog appears — enter the destination name and its ground elevation in metres or feet.
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
Open Menu and select "Search by Postcode".
Enter a UK postcode, address, or place name.
The app searches via OpenStreetMap (Nominatim) and displays the result.
The map pans to the found location.
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
Tap the WIND button to activate measurement mode.
Fly a complete 360° circle in either direction at a steady speed.
A progress indicator shows "STOP X%" as you accumulate heading change.
When a full 360° is detected, the measurement auto-completes.
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".
7. Navigation to Targets
Selecting a Navigation Target
Tap any waypoint or destination marker on the map to make it your active navigation target. The direction circle and target info panel activate immediately.
Direction Circle
A large compass-like ring appears on the map when navigation is active. It rotates to indicate the bearing to your destination relative to your current heading. Fly in the direction the circle points to reach your target.
Target Info Panel (Top-Right)
When navigating, the top-right panel displays:
Target Name — the name of the active waypoint or destination.
Distance — real-time distance to the target.
Traffic Light — on-course status indicator.
Traffic Light Indicator
A colour-coded indicator shows whether you are flying toward your target:
Colour
Meaning
Angle Off-Course
Green
On track — flying toward the target
Within ±15°
Orange
Moderately off track
±15° to ±45°
Red
Significantly off track
More than ±45°
The traffic light can be toggled on or off in Settings.
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
Ensure HOME is set (provides the ground elevation reference).
Tap the GLIDE button.
A coloured ring appears on the map centred on your position.
The ring updates in real time as your altitude changes.
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:
Open Menu > "Group Settings".
Enter your Display Name — how others see you on the map. Only the first 3 characters are shown on markers.
Enter the Group Name — all members must use the exact same name (case-sensitive).
Enter the Group Code — a shared password. All members must use the exact same code.
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
Open Menu > "SOS Contacts".
Tap "Add Contact".
Enter the contact's Name and Phone Number.
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.
Repeat for additional contacts. You can add as many as needed.
Triggering an SOS
Press the red SOS button in the bottom-right corner.
A confirmation dialog appears showing how many contacts will be alerted.
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.
14. Menu Reference
All items accessible from the Menu button (top-left corner):
Menu Item
Description
Manage Waypoints
View, navigate to, or delete saved waypoints.
Manage Destinations
View, navigate to, or delete saved destinations.
Search by Postcode
Find locations by UK postcode, address, or place name.
Group Settings
Configure or leave a flying group.
SOS Contacts
Add, edit, or remove emergency contacts.
Fuel Sensor Settings
Configure BLE fuel sensor, calibrate, set tank capacity and flow mode.
Settings
All display, altitude, map, navigation, and power settings.
Clear Track Line
Erase the blue flight path from the map.
Clear Wind Data
Clear the stored wind measurement.
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:
Scans for the Tiggy Fuel BLE sensor nearby.
Connects to the sensor when found.
Negotiates an optimal data transfer speed (185-byte MTU).
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.
Swipe up or down on the picker to select your tank capacity.
Tap Set Tank Capacity to confirm.
The value is saved to the watch and transmitted to the fuel sensor.
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 Percentage
Current fuel level (0–100%)
Tank Litres
Remaining fuel in litres
Tank Capacity
Configured tank size
Flow Rate
Current consumption (L/min)
Total Litres Consumed
Cumulative fuel used since last reset
Pressure
Fuel system pressure (kPa)
Battery Voltage
Sensor power supply (V)
Timestamp
When the reading was taken
Flow State
Whether 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.
Set Tank Capacity — Open Fuel Settings and enter your tank size in litres. Confirm to send the value to the sensor.
Calibrate Empty — With the tank completely empty, press "Set Empty Point" (phone) or "Lower (Empty)" (watch). This records the zero-fuel pressure baseline.
Calibrate Full — Fill the tank completely, then press "Set Full Point" (phone) or "Upper (Full)" (watch). This records the full-tank pressure baseline.
Select Flow Mode — Choose Linear (standard), High (for low flow rates), or Low (for noisy high-flow systems).
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.