Orion NMEA User Manual
GPS Receiver Module
Micro Modular Technologies Pte. Ltd.
Page 3 of 25
No. 3, Ubi Avenue 3, #03-02 Crocodile House 408857 Singapore
Tel: 65-6745-8832 Fax: 65-6293-0661 Email: sales@micro-modular.com
www.micro-modular.com
3.1
DTM – Datum reference
This sentence contains the ID of the datum selected, along with configured offsets.
$GPDTM,W84,,0.000000,S,0.000000,W,0.00,W84*50
Name
Description
Type
Example
MsgID
DTM Header
$GPDTM
DatumID
Local Datum ID
W84
DatumSubD
Datum Subdivision Code
<null>
LatOfs
Latitude Offset (in minutes)
0.000000
LatDirection
N = North
S = South
S
LonOfs
Longitude Offset (in minutes)
0.000000
LonDirection
E = East
W = West
W
AltOfs
Altitude Offset (in meters)
0.00
RefDatum
Reference Datum ID
W84
ChkSum
Checksum
*50
EOL
NMEA end of line
<CR> <LF>
Table 2 – DTM Sentence Fields
Refer to Section 6 for Datum ID codes.