overland-controller/docs/gps-m9n.md

M9N GPS Module Plan

Role

The M9N GPS module will live in the dashboard enclosure and provide:

• GPS position
• GPS speed
• Satellite/fix status
• UTC time
• Future automatic timezone/DST support
• Optional GPS fallback speed display

Location

Preferred mounting location:

• Inside the top dashboard enclosure
• Under the windshield
• Near the ESP32-S3 dashboard display

This should provide a clean enough sky view for normal vehicle GPS use.

Wiring

Planned connection to dashboard ESP32-S3:

• GPS TX -> ESP32 UART RX
• GPS RX -> ESP32 UART TX, optional
• GPS VCC -> 3.3V or 5V depending on module board
• GPS GND -> dashboard ground

PPS is optional and not required for v1.

V1 Data Goals

Initial GPS fields:

• Fix valid
• Satellite count
• Latitude
• Longitude
• Speed
• UTC time

Future Features

• Automatic timezone lookup
• Automatic DST handling
• Trip logging
• GPS-based speed fallback
• GPS diagnostics screen