Message 1210 (User-Defined Datum); Message 1211 (Map Datum Select) - Navman 12 Designer's Manual

3.5.2.2 Message 1210 (user-defined datum)
This message allows the user to define a datum
to be used by the receiver to transform its position
solution. Up to five user-defined datums may be
stored. Storage of these parameters requires
EEPROM. The contents of the 'user-defined
datum' message are described in Table 3-24.
Note that datum definition does not imply datum
use. Message 1211 is used to specify the 'datum in
Message ID: 1210
Rate: as required (maximum rate is 1 Hz)
Message length: 20 words
Word No.
1-4 Message header
5 Header checksum
6 Sequence number (Note 1)
7
8-9 Semi-major axis - integer part
10 Semi-major axis - fractional part
11 Inverse flattening -integer part
12-13 Inverse flattening - fractional Part
14-15 WGS-84 datum offset - dX
16-17 WGS-84 datum offset - dY
18-19 WGS-84 datum offset - dZ
20
Note 1: The sequence number is a count that indicates whether the data in a particular binary message has been updated or
changed since the last message input.
Message ID: 1211
Rate: as required (maximum rate 1 Hz)
Message length: 8 words
Word No.
1-4
5
6 Sequence number (Note 1)
7
8
Note 1: The sequence number is a count that indicates whether the data in a particular binary message has been updated or
changed since the last message input.
Note 2: Appendix B contains map datum codes from 0 to 188. Codes 300 to 304 are user-defined.
MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.
Name
User datum ID
Data checksum
Table 3-24 Message 1210 (user-defined datum)
Name
Message header
Header checksum
Datum ID (Note 2)
Data checksum
Table 3-25 Message 1211 (map datum select)
use' for the navigation function. Also, any message
1210 that contains an undefined datum code is
ignored.

3.5.2.3 Message 1211 (map datum select).

This message allows the user to select a datum
to be used by the receiver to transform its position
solution. The contents of the 'map datum select'
message are described in Table 3-25.
Type Units
I
UI
UDI m 6 300 000 to 6 400 000
UI m
UI
UDI 0 to 999 999 999
DI m 0 to ±9 000 000
DI m 0 to ±9 000 000
DI m 0 to ±9 000 000
Type Units
I
UI
Range Resolution
0 to 32 767
300-304
0 to 9999 10
280 to 320
10
10
10
10
Range
0 to 32767
0 to 188 and
300 to 304
-4
-9
-2
-2
-2
34