APPENDIX
AP-8
2. Digital Interface
Input sentences
ABK, ACK, ACN, BWC*, BWR*, DBS, DBT, DPT, DTM, GGA, GLL, GNS, HBT, HDT, MTW,
MWV, RMB, RMC, RTE, THS, VBW, VDR, VHW, VTG, VWR, VWT, WPL,
ZDA, !AIVDM, !AIVDO, $AIALR
Output sentences
ABM, ALC, ALF, ALR, ARC, BBM, EVE, HBT, OSD, RSD, TLB, TLL*, TTD, TTM, VSD
*: Not available on IMO radar
Data reception
Data is received in serial asynchronous form in accordance with the standard referenced in
IEC 61162-2.
The following parameters are used:
Baud rate: 38,400 bps: HDT, THS, !AIVDM, !AIVDO and $AIALR.
All other sentences: 4800 bps
Data bits: 8 (D7 = 0), Parity: none, Stop bits: 1
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits
Validity and integrity of input data (mode indicator)
Data indication HDG Latitude and
Longitude
SPD COG/SOG WP
GREEN color
(normal data)
THS-A
HDT
GNS-A,D*
GGA-1 2,3,4,5*
GLL-A,D and (status:
A)*
RMC- A,D and (status:
A)*
VBW-A
VHW
VTG-A,D,P
BWC-A,D
BWR-A,D
RMB-A,D and status A
YELLOW-ORANGE
color
(invalid data)
GNS-E,M,S,N
GGA-0,6,7,8
GLL-E,M,S,N or
(status:V)
RMC-E,M,S,N or
(status:V)
VBW-V
VTG-E,M,S,N
***.*
THS-E, M, S, V
BWC-E,M,S,N
BWR-E,M,S,N
RMB-E,M,S,N or
(status:V)
* Low or doubtful integrity can occur when the GBS sentence gives RAIM error rate of 10 m
or higher and "Age of differential GPS data" in GGA and GNS sentences is 10 seconds or
higher. In this case the ship's latitude and longitude indications are shown in yellow.
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