S A N J O S E N A V I G A T I O N , I N C .
P r o f e s s i o n a l i n N a v i g a t i o n & C o m m u n i c a t i o n
S
S
A
A
N
N
J
J
O
O
S
S
E
E
N
N
A
A
V
V
I
I
G
G
A
A
T
T
I
I
O
O
N
N
,
,
I
I
N
N
C
C
.
.
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32
ISO 9001
NO. T2000-351
8.9 $GPDTM (out) – Datum & Set DGPS parameter
Example
$GPD
TM
,TOY ,M
,00.1697 ,S
,00.1234
,E ,,W84 *05 CR
LF
Field#
1
2
3
4
5
6
7 8
9
#. Description
Range
[Bytes]
1. Local datum code
[3]
2. Local datum sub code
[1]
3. Latitude offset (minute)
[7]
4. Latitude offset mark (N: +, S: -)
[1]
5. Longitude offset (minute)
[7]
6. Longitude offset mark (N: +, S: -)
[1]
7. Altitude offset (m)
Always null
8. Datum
Always “W84”
[3]
9. Checksum
[2]
Interpreting Example
Datum 172