# FPV GPS Module Setup: UBlox M10, Baud Rate, Wiring, and Betaflight Configuration
A GPS module transforms your FPV drone from a pure line-of-sight flyer into a navigation-capable aircraft. With GPS, you gain speed and altitude telemetry, distance-from-home readouts, coordinates in your OSD, and — most importantly — GPS Rescue, which can save your quad when video or radio link fails.
This guide covers everything: choosing the right GPS module, wiring it correctly, configuring Betaflight, and verifying performance.
## GPS Module Selection Guide
| Feature | UBlox M8 (Older) | UBlox M10 (Current) | UBlox M10 + Compass | UBlox F9P (RTK) |
|———|—————–|———————|———————|——————|
| Satellites tracked | GPS + GLONASS | GPS + GLONASS + Galileo + BeiDou | Same as M10 | GPS + GLONASS + Galileo + BeiDou |
| Max update rate | 10 Hz | 10 Hz (25 Hz capable) | 10 Hz | 20 Hz |
| Cold start time | ~30s | ~15s | ~15s | ~10s |
| Accuracy (standard) | ~2.5m | ~1.5m | ~1.5m | ~0.01m (RTK) |
| Compass (magnetometer) | Optional | Optional | Yes | No |
| Weight | 4-8g | 2-5g | 5-10g | 15-30g |
| Price | $10-15 | $12-25 | $15-30 | $150-250+ |
| Recommendation | Budget builds | **Best choice** | GPS Rescue + accurate heading | Survey-grade only |
**Recommendation**: The UBlox M10 is the current sweet spot — fast lock times, excellent accuracy, lightweight, and affordable. Skip M8 modules in 2024; the M10’s multi-constellation support and faster lock times are worth the small price premium. Only get a compass module if you specifically need accurate heading hold for autonomous flight modes (iNav/ArduPilot).
## Wiring Your GPS Module
GPS modules communicate via UART (serial). You need four connections:
| GPS Pin | FC Connection | Notes |
|———|—————|——-|
| VCC (5V) | 5V pad | Most GPS modules run on 5V. Some micro modules accept 3.3-5V. |
| GND | GND pad | Common ground |
| TX | RX on a free UART | GPS transmits data → FC receives |
| RX | TX on same UART | FC transmits config → GPS receives (optional for UBlox protocol) |
| SDA (compass) | SDA pad | Only for compass-equipped modules |
| SCL (compass) | SCL pad | Only for compass-equipped modules |
**Wiring tips**:
– Run GPS wires away from VTX antenna and ESC power leads
– Mount the GPS module on top of the battery or on a rear arm with clear sky view
– Keep the ceramic patch antenna facing up (it is directional)
– Use a small piece of double-sided tape and a zip tie to secure the module
## Betaflight GPS Configuration
### Step 1: Enable GPS on the Ports Tab
1. Open Betaflight Configurator → **Ports** tab
2. Find the UART your GPS is connected to (e.g., UART 3 or UART 6)
3. Under “Sensor Input,” set it to **GPS** at baud rate **115200** (or **57600** for older M8 modules)
4. Click **Save and Reboot**
### Step 2: Configure GPS Settings
Navigate to the **Configuration** tab → **GPS** section:
| Setting | Value | Notes |
|———|——-|——-|
| Protocol | UBLOX | Most common. Also: NMEA (generic) |
| Auto Config | ON | Betaflight auto-configures the GPS for 10Hz + Galileo |
| Auto Baud | ON | Automatically detects baud rate |
| Galileo | ON | Adds European Galileo constellation — more satellites |
| Ground Assistance Type | Auto Detect | For automated GPS Rescue altitude |
### Step 3: Verify GPS Lock
1. Go to the **GPS** tab in Betaflight (top bar)
2. Plug in the battery (props off)
3. Place the quad outside or near a window
4. Watch the “3D Fix” indicator — it should go from False → True within 10-30 seconds
5. Check satellite count — you should see 12-20+ satellites with an M10 module
| Indicator | Meaning |
|———–|———|
| 3D Fix = False | No lock yet — keep waiting or move to clearer sky |
| 3D Fix = True, Sats < 8 | Weak lock — adequate for telemetry, not reliable for Rescue |
| 3D Fix = True, Sats > 12 | Strong lock — ready for GPS Rescue |
| HDOP < 1.0 | Excellent positional accuracy |
| HDOP > 2.0 | Poor accuracy — wait for better lock |
### Step 4: OSD Elements
Add these GPS elements to your OSD (go to the **OSD** tab):
| Element | What It Shows | Recommended Position |
|———|—————|———————-|
| GPS Speed | Ground speed in km/h or mph | Top center |
| GPS Altitude | Altitude above home point | Right side |
| GPS Satellites | Number of satellites locked | Top bar |
| Home Distance | Distance from arm point | Bottom center |
| Home Direction Arrow | Arrow pointing to home | Center crosshair area |
| GPS Coordinates | Lat/Lon (for recovery) | Bottom right |
## GPS Rescue Configuration
GPS Rescue brings your quad back and lands it if your radio link fails. Basic setup:
1. Go to **Failsafe** tab
2. Set Stage 2 to **GPS Rescue**
3. Configure:
– **Minimum satellites**: 8 (won’t activate without this many)
– **Altitude mode**: Maximum (climb to set altitude first)
– **Initial climb altitude**: 50m (clears most obstacles)
– **Return speed**: 15 m/s (adjust to preference)
– **Ground speed**: 5 m/s (landing descent)
– **Sanity checks**: ENABLED (critical — prevents fly-aways if GPS data is bad)
**CRITICAL**: Always test GPS Rescue in a controlled environment before relying on it. Set up a switch on your radio to manually trigger Rescue mode, fly to a safe distance, and verify the quad returns correctly.
## Common GPS Problems and Solutions
| Problem | Cause | Fix |
|———|——-|—–|
| No GPS detected in Betaflight | Wrong UART or baud rate | Check Ports tab, verify wiring |
| GPS never gets 3D Fix | Module obstructed or indoors | Move outside, ensure clear sky view |
| GPS takes >2 minutes to lock | Cold start, no battery backup | Wait — or add a small backup battery |
| GPS telemetry jumps around | Poor satellite geometry (high HDOP) | Wait for more satellites |
| GPS Rescue flies wrong direction | Compass interference (if compass GPS) | Disable compass, use GPS heading only |
| Altitude drifting | Barometer interference from wind | Shield barometer with open-cell foam |
## Product Recommendation
For a fast-locking M10 GPS module at a great price, check out the **[UBlox M10 GPS modules at uavmodel.com](https://uavmodel.com)**. They offer compact modules with integrated ceramic patch antennas that lock 15+ satellites in under 20 seconds — perfect for GPS Rescue and telemetry.
## GPS Setup and Rescue Walkthrough
## Frequently Asked Questions
### Do I need a compass (magnetometer) for GPS Rescue?
No. Betaflight GPS Rescue uses GPS heading derived from movement, not a compass. A compass is only needed if you want accurate heading while stationary (for iNav/ArduPilot autonomous modes).
### Why does my GPS take so long to lock after power-up?
First-time lock (cold start) requires the GPS to download the satellite almanac, which takes 12-30 seconds. Subsequent warm starts (within a few hours) are much faster. M10 modules are significantly faster than M8.
### Can GPS work indoors?
Rarely. GPS signals are weak and do not penetrate buildings well. For reliable lock, you need a clear view of the sky. A window can work for bench testing, but don’t expect indoor flight performance.
### What baud rate should I use for UBlox M10?
115200 is standard and recommended. Some modules default to 9600, but Betaflight’s “Auto Baud” feature will detect and reconfigure them automatically.