Introduction

GPS sensor is needed for every autonomous features, this sensor provides:

• position with Lat/Lon coordinates and altitude,
• velocity
• time

Preferred protocol is UBX, more efficient than NMEA and should provide a most accurate velocity state.

Another thing to consider when GPS features are wanted: refresh rate, at least 5Hz.

A GPS without a compass/magnetometer has some value when flying FPV with an on screen display (OSD) or returning data to the LibrePilot Ground Control Station (GCS). Telemetry, such as altitude or ground speed and distance may be available. Recording latitude and longitude could be available and would be useful attempting to locate a lost craft.

Capabilities NOT available without a properly functioning compass/magnetometer are all GPS Flight modes like GPS Assist, PositionHold, CourseLock, VelocityRoam, HomeLeash, AbsolutePosition, ReturnToBase, Land, PathPlanner and AutoTakeOff.

Although the Revolution flight controller has an on-board magnetometer it cannot provide dependable data for smaller craft (250mm).