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GPS Rescue Setup GuideUpdated 2 months ago

GPS Rescue is a safety feature in Betaflight that can attempt to guide the drone back toward the home position if signal loss occurs.

GPS Rescue is especially useful for long-range and mid-range FPV flying, but it is not a fully autonomous or guaranteed return-to-home system.

Incorrect configuration can result in unstable behavior, crashes, or flyaways. GPS Rescue must therefore be configured and tested carefully. 

Important safety notice

GPS Rescue is:

  • not an autonomous navigation system,
  • not a guaranteed return-to-home feature,
  • and not a replacement for safe flight planning.

GPS Rescue can be affected by:

  • weak GPS signal,
  • incorrect settings,
  • magnetic interference,
  • wind,
  • signal problems,
  • sensor errors,
  • or insufficient satellite reception.

Always test GPS Rescue carefully in a safe environment before relying on it.

Requirements

Before setup, make sure:

  • Betaflight 4.1 or newer is installed
  • Betaflight 4.5 or newer is recommended for modern M10 GPS modules
  • A compatible GPS module is installed
  • GPS is correctly wired to the flight controller
  • Receiver and failsafe are already configured correctly
  • The drone flies normally and stably in regular flight

GPS Rescue should never be configured on a drone that already has unresolved flight issues.

Supported GPS modules

Commonly used GPS modules include:

  • BN-180
  • BN-220
  • M8 GPS modules
  • M10 GPS modules

M10 GPS modules generally provide:

  • faster GPS lock,
  • improved accuracy,
  • and more stable satellite connections.

Step 1 — Mount the GPS correctly

The GPS module should:

  • be mounted as far away from the VTX as possible,
  • have a clear view of the sky,
  • not be blocked by carbon fiber plates,
  • and be exposed to minimal electrical interference.

Typical mounting location:

  • rear section of the drone.

Step 2 — Wire the GPS correctly

GPS modules connect through a UART:

  • GPS TX → FC RX
  • GPS RX → FC TX
  • 5V → 5V
  • GND → GND

Do not reverse TX and RX.

After wiring:

  • inspect solder joints,
  • avoid short circuits,
  • and verify all connectors.

Step 3 — Configure the UART in Betaflight

In Betaflight:

  1. Open the Ports tab
  2. Find the UART connected to the GPS
  3. Under “Peripherals” select GPS
  4. Click Save and Reboot

Do not enable Serial RX on the same UART.

Step 4 — Enable GPS in Betaflight

Then:

  1. Open the Configuration tab
  2. Enable GPS
  3. Select the GPS protocol

Most modern GPS modules use:

  • UBLOX

Then:

  • Click Save and Reboot

If available, you may optionally enable:

  • Magnetometer

However, a magnetometer is not required for most FPV setups.

Step 5 — Verify GPS operation

After rebooting:

  • Place the drone outside
  • Ensure clear sky visibility
  • Wait several minutes for GPS lock

The first GPS lock after changing location may take longer.

Check:

  • satellite count,
  • GPS coordinates,
  • home point,
  • and GPS OSD indicators.

Minimum:

  • 6 satellites

Recommended:

  • 8 or more satellites

More satellites improve:

  • positioning accuracy,
  • stability,
  • and GPS Rescue performance.

Do not take off with a weak GPS fix.

Step 6 — Configure GPS Rescue as failsafe

In Betaflight:

  1. Open the Failsafe tab
  2. Under “Stage 2 Failsafe Procedure” select GPS Rescue
  3. Click Save and Reboot

When signal loss occurs, the drone will attempt to:

  • climb to a safe altitude,
  • return toward the home point,
  • and begin descending.

Important GPS Rescue settings

Minimum Satellites

Recommended:

  • at least 6,
  • preferably 8 or more.

GPS Rescue should never activate without a stable GPS lock.

Rescue Altitude / Initial Climb

The drone should climb high enough to safely clear:

  • trees,
  • buildings,
  • power lines,
  • and terrain obstacles.

Altitude set too low may result in collisions.

Rescue Ground Speed

Excessive speeds may cause:

  • overshooting,
  • instability,
  • or inaccurate return behavior.

Moderate values are usually safer.

Descent Distance and Descent Speed

Very aggressive descent rates may cause hard landings.

GPS Rescue is primarily designed to:

  • return the drone closer to the pilot,
  • not to perform precise autonomous landings.

Step 7 — Configure a manual GPS Rescue switch

In addition to failsafe activation, GPS Rescue should also be assigned to a dedicated switch.

In Betaflight:

  1. Open the Modes tab
  2. Select GPS Rescue
  3. Assign an AUX switch
  4. Click Save

This allows GPS Rescue to be:

  • tested safely,
  • or activated manually if needed.

Step 8 — Test GPS Rescue safely

Never use GPS Rescue for the first time during a long-range flight.

Safe testing recommendations:

  • Use a large open area
  • Ensure strong GPS signal
  • Fly at safe altitude
  • Avoid people and obstacles nearby

Recommended test procedure:

  1. Fly the drone normally
  2. Reach a safe altitude
  3. Activate the manual GPS Rescue switch
  4. Observe whether the drone:
    • climbs correctly,
    • turns toward the home point,
    • and returns steadily.

If the drone behaves unexpectedly:

  • disable GPS Rescue immediately,
  • and regain manual control.

Common problems

No GPS lock

Possible causes:

  • Poor GPS placement
  • Incorrect wiring
  • TX/RX reversed
  • Wrong UART
  • Incorrect GPS protocol
  • VTX or electrical interference

GPS Rescue drifts or returns inaccurately

Possible causes:

  • Too few satellites
  • Weak GPS signal
  • Strong wind
  • Incorrect GPS configuration
  • Poor GPS antenna performance
  • Magnetic interference

GPS Rescue does not activate

Please verify:

  • Failsafe configured correctly
  • Sufficient satellite count
  • GPS Rescue switch assigned correctly
  • Home point recorded
  • GPS Rescue activation conditions met

Drone does not return correctly

Please verify:

  • Correct flight controller orientation
  • Proper GPS operation
  • Stable GPS signal
  • Sufficient Rescue Altitude
  • Stable normal flight behavior

GPS Rescue may not function reliably if:

  • the drone already flies poorly,
  • excessive vibration exists,
  • or major tuning/configuration problems are present.

Important pre-flight recommendations

Before every flight, verify:

  • Sufficient satellite count
  • Home point recorded
  • Stable GPS indicator
  • Stable receiver link
  • Battery fully charged
  • Antennas mounted correctly

Before contacting support

Please collect:

  • Order number
  • Drone model
  • Betaflight version
  • GPS model
  • Screenshot of the Ports tab
  • Screenshot of the GPS tab
  • Screenshot of the Failsafe tab
  • Screenshot of the Modes tab
  • Satellite count
  • DVR or flight video if available
  • CLI diff all output

Contact our support team at:

[email protected]

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