The garminnmea driver controls a Garmin handheld GPS unit, via a RS232 link. The driver was developed using the Garmin Geko 201, but it should work with other Garmin units. It is unlikely to work with non-Garmin GPS units, as at least one proprietary Garmin NMEA sentences is being used.
This driver is also capable of operating the unit in DGPS mode using RTCM corrections. The driver listens on a network socket for RTCM packets generated by a remote DGPS base station; the packets are forwarded over the serial port to the GPS unit, which responds by switching into DGPS mode. The dgps_server utility found in the utils/dgps_server directory may be used to generate RTCM corrections; corrections are transmitted to clients using UDP multicast.
Supported interfaces:
Required devices:
Supported configuration requests:
| Name | Type | Default | Meaning |
| port | string | "/dev/ttyS0" | The serial port to be used |
| dgps_enable | integer | 1 | Enable DGPS RTCM forwarding |
| dgps_group | string | 225.0.0.43 | Multicast group for RTCM corrections |
| dgps_port | integer | 7778 | Port number for RTCM corrections |