Furuno BACK GP-80 - Manual (Page 82)

A-10
DBT - Depth below transducer
$--DBT,x.x,f,x.x,M,x.x,F*hh<CR><LF>
| | | | | | |
| | | | | | +--------- 4
| | | | +--+----------- 3
| | +--+----------------- 2
+--+----------------------- 1
1. Water depth, feet
2. Water depth, m
3. Water depth, fathoms
4. Checksum
DPT - Depth
$--DPT,x.x,x.x,x.x*hh<CR><LF>
| | | |
| | | +----- 4
| | +--------- 3
| +------------ 2
+---------------- 1
1. Water depth relative to trancsducer, in meters
2. Offset from transeducer, in meters(see notes 1 and 2)
3. Maximum range scale in use
4. Checksum
NOTE1 "positive"=distance from transeduser to water-line.
"-"=distance from transducer to keel.
NOTE2 For IEC applications the offset should always be applied
so as to provide depth relative to the keel.
DTM - Datum reference
$--DTM,ccc,a,x.x,a,x.x,a,x.x,ccc*hh<CR><LF>
| | | | | | | | |
| | | | | | | | +--- 7
| | | | | | | +------ 6
| | | | | | +---------- 5
| | | | +--+------------- 4
| | +--+------------------- 3
| +------------------------- 2
+---------------------------- 1
1. Local datum W84 - WGS84
W72 - WGS72
S85 - SGS85
P90 - PE90
999 - User defined
IHO datum code
2. Local datum subdivision code
3. Lat offset, min, N/S
4. Lon offset, min, E/W
5. Altitude offset, m
6. Reference dattum W84 - WGS84
W72 - WGS72
S85 - SGS85
P90 - PE90
7. Checksum