Garmin Garmis GPS Smart Antenna GP35-LVC - Manual (Page 19)

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4.1.2 Sensor Initialization Information (PGRMI)
The $PGRMI sentence provides information used to initialize the sensor board set position and time
used for satellite acquisition. Receipt of this sentence by the board set causes the software to restart the
satellite acquisition process. If there are no errors in the sentence, it will be echoed upon receipt. If an
error is detected, the echoed PGRMI sentence will contain the current default values. Current PGRMI
defaults can also be obtained by sending $PGRMIE to the board.
$PGRMI,<1>,<2>,<3>,<4>,<5>,<6>,<7>*hh<CR><LF>
<1> Latitude, ddmm.mmm format (leading zeros must be transmitted)
<2> Latitude hemisphere, N or S
<3> Longitude, dddmm.mmm format (leading zeros must be transmitted)
<4> Longitude hemisphere, E or W
<5> Current UTC date, ddmmyy format
<6> Current UTC time, hhmmss format
<7> Receiver Command, A = Auto Locate, R = Unit Reset.
4.1.3 Sensor Configuration Information (PGRMC)
The $PGRMC sentence provides information used to configure the sensor board operation.
Configuration parameters are stored in non-volatile memory and retained between power cycles. The
GPS 35LP will echo 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 board.
$PGRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>*hh<CR><LF>
<1> Fix mode, A = automatic, 2 = 2D exclusively (host system must supply altitude), 3 = 3D
exclusively
<2> Altitude above/below mean sea level, -1500.0 to 18000.0 meters
<3> Earth datum index. If the user datum index (96) is specified, fields <4> through <8> must
contain valid values. Otherwise, fields <4> through <8> must be null. Refer to Appendix A for a
list of earth datums and the corresponding earth datum index.
<4> User earth datum semi-major axis, 6360000.0 to 6380000.0 meters (.001 meters resolution)
<5> User earth datum inverse flattening factor, 285.0 to 310.0 (10-9 resolution)
<6> User earth datum delta x earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
<7> User earth datum delta y earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
<8> User earth datum delta z earth centered coordinate, -5000.0 to 5000.0 meters (1 meter
resolution)
<9> Differential mode, A = automatic (output DGPS data when available, non-DGPS otherwise), D =
differential exclusively (output only differential fixes)
<10> NMEA Baud rate, 1 = 1200, 2 = 2400, 3 = 4800, 4 = 9600, 5 = 19200, 6 = 300, 7 = 600
<11> Velocity filter, 0 = No filter, 1 = Automatic filter, 2-255 = Filter time constant (10 = 10 second
filter
<12> PPS mode, 1 = No PPS, 2 = 1 Hz
<13> PPS pulse length, 0-48 = (n+1)*20msec. Example n = 4 ð 100 msec pulse
<14> Dead reckoning valid time 1-30 (sec)