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5. To disable transmission of the HDT sentence:
$PMARSETPX,SSC300,,02,0
6. To enable transmission of the HDT sentence at intervals of 100 ms:
$PMARSETPX,SSC300,,02,100
7. To disable transmission of the ROT sentence:
$PMARSETPX,SSC300,,03,0
8. To enable transmission of the ROT sentence at intervals of 100 ms:
$PMARSETPX,SSC300,,03,100
9. To disable transmission of the PMAROUT sentence:
$PMARSETPX,SSC300,,04,0
10. To enable transmission of the PMAROUT sentence at intervals of 1 sec:
$PMARSETPX,SSC300,,04,1000
PMARSETP – Maretron Proprietary Set Period Sentence
NOTE: This sentence is included for compatibility with older versions of SSC300 firmware. The
PMARSETPX sentence offers finer resolution and should be used if available.
The SSC300 can be programmed to enable or disable the periodic transmission of the HDG, HDM,
HDT, ROT, and PMAROUT sentences. In addition, the periodic transmission rate for these sentences
and the Variation Lifetime (see RMC and VTG) can be programmed using this sentence.
$PMARSETP,SSC300,,A,B*hh<CR><LF>
Field A: Identifier code, identifies the sentence or parameter to be programmed (see following table)
B: Integer where "0" disables sentence and positive numbers are multipliers of 1ms (i.e.,
programmed integer of 2 would mean a 200ms transmission interval)
SSC300 NMEA 0183 Initiated Deviation Calibration
NMEA 0183 initiated deviation calibration is accomplished by turning the vessel through at least
3 complete circles after the SSC300 receives a Maretron proprietary NMEA 0183 sentence. The
procedure is as follows:
1. Ensure that the compass has been properly installed per Section 2,
2. Warm up the compass by operating it for approximately 10 minutes,
3. Turn the vessel (either direction) such that you complete a full 360° turn in 2½ minutes or
less (try not to go below 1 minute for a complete circle),
4. Send the following Maretron proprietary NMEA0183 sentence to the SSC300 while
continuing to turn the vessel:
a. $PMAREXE,SSC300,,FD,0,,,<CR><LF> This will turn off all periodic transmissions
such that you can easily see status messages associated with the calibration
process
b. $PMAREXE,SSC300,,F0,,,,<CR><LF> This will initiate a reset and force the
SSC300 to start the calibration process
Revision 1.0
Identifier Code
00
01
02
03
04
0A
Variation Lifetime
Appendix A – NMEA 0183 Interfacing
Sentence
Default Rate
HDG
1 or 100ms
HDM
0 or Disabled
HDT
0 or Disabled
ROT
2 or 200ms
PMAROUT
10 or 1sec
50 or 5sec
Page A5
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