Appendix D - Nmea Data Output Messages; Nmeadtm (Ascii); Table 37: Dtm Message Output Format - Oceaneering C-NavX1 User Manual

11.4 Appendix D – NMEA Data Output Messages

11.4.1 NMEADTM (ASCII)

This output stream reports the local geodetic datum and datum of f sets from a ref erence datum. It is in compliance
with NMEA-0183 Standards version 4.1.
Default: The NMEADTM message will be scheduled to display automatically before the most frequent NAV
message (NMEAGGA, NMEAGLL or NMEARMC). If the frequency or any other NAV message is changed, the
adjusted NMEADTM message will automatically display before the most frequent one
•
When the datum code is unknown (e.g. RTK mode), the output will be empty.

Table 37: DTM Message Output Format

Field # Field Name
F1 Local datum code
Local datum subdivision
F2
code
F3 Lat of f set
F4 N/S
F5 Lon of f set
F6 E/W
F7 Altitude of f set
F8 Ref erence datum code
F9
CNAV-MAN-061
Revision B
C-NavX1 GNSS Receiver User Manual
Description
Local Datum Code
W84 = WGS84
W72 = WGS72
S85 = SGS85
PE90 = P90
999 = User def ined
Local datum subdivision code
(if available)
Latitude of f set f rom ref erence position (in minutes)
Direction of latitude (N=north, S= south)
Longitude of f set f rom ref erence position (in minutes)
Direction of longitude (E= east, W= west)
Altitude of f set f rom ref erence position (in meters)
Ref erence Datum Code
W84 = WGS84
W72 = WGS72
S85 = SGS85
PE90 = P90
Checksum
DOC-TEM-28-NUM Rev A Uncontrolled copy when printed
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