MAVLINKHUD
Download Android App Professional ArduPilot Ground Station
Full Parameter PDF

Overview

The NMEA parameter group configures the NMEA 0183 data output from the autopilot. This is used to share the vehicle's position with external devices that expect a standard GPS-style serial stream (e.g., marine radars, handheld GPS units, or legacy data loggers).

Key Concepts

1. Message Selection (NMEA_MSG_EN)

Determines which standard NMEA sentences are included in the serial stream.

  • GGA: Global Positioning System Fix Data (Time, Position, Fix Quality).
  • RMC: Recommended Minimum Specific GNSS Data (Time, Position, Speed, Date).
  • VTG: Course Over Ground and Ground Speed.

Parameter Breakdown

  • NMEA_MSG_EN: Bitmask of enabled NMEA messages.

Integration Guide

  1. Port Setup: Set SERIALx_PROTOCOL = 15 (NMEA Output) on the desired UART.
  2. Baud Rate: Set the baud rate to match the receiving device (usually 4800 or 9600).
  3. Config: Enable the required messages in NMEA_MSG_EN.

Developer Notes

  • Library: libraries/AP_NMEA_Output.

Messages Enable bitmask

NMEA_MSG_EN: Messages Enable bitmask

Description

This is a bitmask of enabled NMEA messages. All messages will be sent consecutively at the same rate interval.

Values

  • Bitmask:
    • Bit 0: GPGGA (Global Positioning System Fix Data)
    • Bit 1: GPRMC (Recommended Minimum Specific GPS/Transit Data)
    • Bit 2: PASHR (Pitch, Roll, and Heading)

Description

This parameter controls which standard NMEA 0183 sentences are output by the autopilot when configured as an NMEA source.

  • Usage: Typically used to feed position and attitude data to external payloads, cameras, or trackers that expect NMEA format (rather than MAVLink).
  • Default (3): Enables GGA and RMC (3 = 1 + 2).

Source Code

ardupilot/libraries/AP_NMEA_Output/AP_NMEA_Output.cpp

View Source
Network Configuration (NET) No-Go Zone Configuration (NO)