Garmin GPS 50 Owner's Manual page 63

Accuracy:
Dynamics:
INTERFACES
NMEA 0180
NMEA 0182
NMEA 0183 (Version 1.5; December 1987)
Approved sentences:
GPBWC, GPGLL, GPRMB, GPRMC, GPR00, GPWPL, GPXTE
Proprietary sentences:
PGRMA
Transmission rate:
GPBWC, GPGLL, GPRMB, GPRMC, GPXTE, and PGRMA
transmitted once every two seconds.
GPR00 transmitted once every (# of route waypoints + 1) * 2
seconds. e.g., if there are two route waypoints, this sentence will
be transmitted once every six seconds.
GPWPL transmitted # of route waypoints times in (# of route
waypoints + 1) * 2 seconds. e.g., if there are two route waypoints,
this sentence will be transmitted twice every six seconds.
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NOTES:
* All specifications are subject to change without notice.
** Subject to accuracy degradation to 100m 2DRMS under the United
States Department of Defense imposed Selective Availability program.
C-2
Position: 15 meters (49 ft) RMS
Velocity: 0.1 knots RMS steady state
90 knots velocity, 3g dynamics
**