Garmin 15H-W - GPS Technical Specifications - page 16
190-00266-01
GPS 15H & 15L Technical Specifications
Rev. D
Page 12
4.1.2
Sensor Initialization Information (PGRMI)
The $PGRMI sentence provides information used to initialize the GPS sensor’s set position and time used
for satellite acquisition. Receipt of this sentence by the GPS sensor causes the software to restart the
satellite acquisition process. If there are no errors in the sentence, it is echoed upon receipt. If an error is
detected, the echoed PGRMI sentence will contain the current default values. Current PGRMI defaults
(with the exception of the Receiver Command, which is a command rather than a mode) can also be
obtained by sending $PGRMIE to the GPS sensor.
$PGRMI,,,,,,,*hh
Latitude, ddmm.mmm format (leading zeros must be transmitted)
Latitude hemisphere, N or S
Longitude, dddmm.mmm format (leading zeros must be transmitted)
Longitude hemisphere, E or W
Current UTC date, ddmmyy format
Current UTC time, hhmmss format
Receiver Command, A = Auto Locate, R = Unit Reset
4.1.3
Sensor Configuration Information (PGRMC)
The $PGRMC sentence provides information used to configure the GPS sensor’s operation. Configuration
parameters are stored in non-volatile memory and retained between power cycles. The GPS sensor echoes
this sentence upon its receipt if no errors are detected. If an error is detected, the echoed PGRMC sentence
will contain the current default values. Current default values can also be obtained by sending $PGRMCE
to the GPS sensor.
$PGRMC,,,,,,,,,,,,,,*hh
Fix mode, A = automatic, 2 = 2D exclusively (host system must supply altitude),
3 = 3D exclusively
Altitude above/below mean sea level, -15H & 15L00.0 to 18000.0 meters
Earth datum index. If the user datum index (96) is specified, fields through must
contain valid values. Otherwise, fields through must be null. Refer to
for a list of earth datums and the corresponding earth datum index.
User earth datum semi-major axis, 6360000.000 to 6380000.000 meters (.001 meters
resolution)
User earth datum inverse flattening factor, 285.0 to 310.0 (10
-9
resolution)
User earth datum delta x earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
User earth datum delta y earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
User earth datum delta z earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
Differential mode, A = automatic (output DGPS data when available, non-DGPS otherwise), D
= differential exclusively (output only differential fixes)
NMEA 0183 Baud rate, 1 = 1200, 2 = 2400, 3 = 4800, 4 = 9600, 5 = 19200, 6 = 300, 7 = 600,
8 = 38400
Velocity filter, 0 = No filter, 1 = Automatic filter, 2-255 = Filter time constant (e.g., 10 = 10
second filter)
PPS mode, 1 = No PPS, 2 = 1 Hz
PPS pulse length, 0-48 = (n+1)*20 ms. Example: n = 4 corresponds to a 100 ms wide pulse
Dead reckoning valid time 1-30 (sec)
All configuration changes take effect after receipt of a valid value except baud rate and PPS mode. Baud
rate and PPS mode changes take effect on the next power cycle or an external reset event.