Raytheon STD 21 GPS Operation Manual page 106

4.4.2 NMEA messages - - conlusions/dependencies
For configuration of "Serial Port #3" and "Serial Port #4" (see sections 3.5.2 and 3.5.3).
Depending on position of the DIP--switches 4, 5 and 6 (see section 3.3.6) different
NMEA telegrams can be adjusted for Port#3 and Port#4.
DIP--switches 4 OFF
or
DIP--switch 4 and 5 ON
----HDT (IIHDT)
GPHDT
HEHDT
______________________________________________________________________
If DIP--switches 4 and 5 are in "ON" position
then
following NMEA telegrams are inactive:
GPROT = Rate of Turn from a Satellite compass
IIGGA
IIDTM
IIGSA
IIZDA
IIVTG
3717/110--850.DOC020002
DIP--switches 4 and 6 ON
or
DIP--switch 4, 5 and 6 ON
----THS (IITHS)
GPTHS
HETHS
= Global positioning system fixed data, time, position and fix related data for
Satellite receiver
= Calender datae beeing used
= GPS DOP and active satellites
= Time & Date -- UTC, day, month, year and local time zone
= Track made good and ground speed
Satellite Compass
STD 21 GPS
98
no header means
Integrated Instrumentaion
Edition: Feb. 23, 2009