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Old 09-05-2019, 03:08   #1
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Vladis's Avatar

Join Date: Oct 2010
Location: Espinho, Portugal
Boat: Beneteau, Oceanis 40
Posts: 109
Wrong Raymarine TWS display


(I am sorry if you you find this post in another English speaking forum but I am without ideas)

During this winter maintenance I repaired the connection near the mast of the multiwire cable that brings data from the wind transducer. It was the 8 volt wire that was interrupted. My system is a Raymarine SeatalkNG as depicted here:

Electronic Setup of Margarida - Vela Navega Forum

As soon as I fixed the connection I got wind data again in the instruments. However the boat went to the water 2 weeks ago and I am noticing a strange malfunction. It is erratic. Some times the error appears sometimes it does not. The error is that when wind speed is low the TWS freezes and is precisely equal in value to the Speed Through Water. And, when it happens, the True Wind Angle is exactly the direction from behind the boat. This never happens when TWS is greater than, say, 10 knots. As soon the wind increases it looks like the system works perfectly. I set SOG and STW as the reference to evaluate the TWS but got no difference. Any feedback is much appreciated.

(someone asked me if the cups were rotating and I answered as follows)

Yes they are turning. I am just sailing from Zakinthos to Kiparissia with COG about 130 degrees with error On. I turned back to 310 degrees and the the reading started to work showing about 9 knots from North.

(also I was asked about AWA and AWS)

AWA is always right. AWS shows 0 when the error is On. I just measured the voltage at the yellow wire when it reaches the box/pod (that converts to seatalk) and I get a varying voltage of between 3.8 to 4.1 volts which looks compatible (?) with the the apparent wind speed of 3 to 4 knots (what I just got in a time that the error was Off). I need the help of another person to check if the error is On or Off while I measure the voltage (locations are apart). I start to think that the problem is in the Pod. The first one failed after 5 years. This one has 3 years from new.

Regards and Thanks, Luis
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