JRC JHS-183 Instruction Manual page 116

(2.1.10) DSR – DSC transponder response
$--DSR,x,x,xxxxxxxxxx,xx,c--c,......,xx,c--c,a*hh<CR><LF>
Data set '1'
Vessel MMSI
Message number
Total number of messages
(2.1.11) DTM – Datum reference
$--DTM,ccc,a,x.x,a,x.x,a,x.x,ccc*hh<CR><LF>
Lon offset, min, E/W SGS85 = S85
Lat offset, min, N/S PE90 = P90
Local datum subdivision code
Local datum: WGS84 = W84
WGS72 = W72
SGS85 = S85
PE90 = P90
User defined = 999
IHO datum code
(2.1.12) EPV – Command or report equipment property value
$--EPV,a,c--c,c--c,x.x,c--c,*hh<CR><LF>
Value of property to be set
Property identifier for the property to be set
Unique identifier
Destination equipment type
Sentence status flag
8-6
Expansion indicator
Data Set 'n'
Additional data sets
Reference datum WGS84 = W84
Altitude offset, m WGS72 = W72