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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
-9
310.0 (10
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>
GPS 30 - Not used. Null field
GPS 30 SL NMEA Baud Rate, 1 = 1200, 2 = 2400,
3 = 4800, 4 = 9600
<11>
Velocity filter (GPS 30 - Rev. 1.31 or later; GPS 30
SL - All revs), 1 = Automatic filter, 2-255 = Filter
time constant (10 = 10 second filter)
<12>
Not used.
All configuration changes take effect after receipt or a valid
value except baud rate (GPS 30 SL only) which takes effect
on the next power cycle or external reset event. Null fields
in the configuration sentence indicate no change in the
particular configuration parameter.
4.1.4 Output Sentence Enable/Disable ($PGRMO
GARMIN proprietary format)
The $PGRMO sentence provides the ability to enable and
disable specific output sentences. The GPS 30 will default
to all output sentences enabled upon system power-up.
The GPS 30 SL will retain user configured sentence
selection for all subsequent power cyles.
$PGRMO,<1>,<2>*hh<CR><LF>
20
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