WX Series WeatherStation Technical Manual revision 1.000
Proprietary and Confidential
PRELIMINARY - DRAFT
9
NMEA 0183 TRANSMITTED SENTENCE
$GP
DTM
$PAMTC,EN:
DTM
Default Interval (m:ss.00)
0:1.00
Enabled By Default:
No
Summary
NMEA 0183 standard Datum Reference.
Syntax
$GPDTM,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>*hh<CR><LF>
Fields
<1>
Three character alphabetical code for local datum:
W84 (WGS84)
W72 (WGS72)
S85 (SGS85)
P90 (PE90)
or IHO datum code from the International Hydrographic
Organization Publication S-60 Appendices B and C.
<2>
One character subdivision datum code when available, as defined in
IHO Publication S-60 Appendices B and C.
<3>
Latitude offset, to the nearest .0001 minute
<4>
N if field <3> is North Latitude
S if field <3> is South Latitude
<5>
Longitude offset, to the nearest .0001 minute
<6>
E if field <5> is East Longitude
W if field <5> is West Longitude
<7>
Signed altitude offset, to the nearest meter
<8>
3-character reference datum code:
W84 = WGS-84
Notes
Latitude and longitude offsets are positive numbers; the altitude offset may be
negative. Offsets change with position; position in the local datum is offset from
the position in the reference datum in the directions indicated:
P
local datum
= P
ref datum
+ offset
KGS, OHI-A, OHI-B, OHI-C, OHI-D, OHI-M, SIR, P90, and S85 are not
currently supported by the GPS Engine used in the the WX Series WeatherStation
Sensor, and therefore are not available for use as Local Datum.
