Autohelm
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Autohelm
SeaTalk Service Manual
18
5.4 Autohelm 7000 N.M.E.A 0183 Data input Format.
The 7000 must receive Cross Track Error data at least once every 30 seconds.
If a display of Waypoint bearing and distance is required then this information must
be received at least once every 30 seconds. All N.M.E.A data is read into a buffer
thus enabling the 7000 to cope with delays between characters and delays between
sentences. All Talker Identifier characters, i.e. RA, DE, LC etc. are ignored allowing
interface with any type of equipment so long as the sentence type is one of the
following:-
Track
Control
Bearing to
Waypoint
Distance to
Waypoint
Apparent Wind Speed &
Direction
XTE APB WDR VWR
XTR BPI WDC
APA BWR BPI
APB BWC BWR
RMB BER BWC
BEC BER
RMB BEC
RMB
Apparent Wind Speed and Angle can be received from any external equipment
transmitting the N.M.E.A. VWR header. The ST7000 will only display apparent wind
direction but will convert and retransmit both apparent wind speed and apparent wind
direction on the Seatalk bus. This information can then be displayed on an ST50 wind
instrument acting as a repeater.
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