Join Date: Feb 2002
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Raytheon Bidata ST 40
I have a bidata ST 40 and have problems with it. It took me almost a year to find out that the silly thing wasnt showing correct speed. I was sooo lucky when the old boat was humming around with almost 4 knots. Than I got a handheld GPS and hold on ... Instantly the boat was almost going 5.5 knots.... lol
So far so good. I get the rather cumbersome description of the Raytheon and find out, that i can actually adjust the speed...
The problem is that the instrument only shows correct speed around 3 knots. Slower and the ST 40 shows less than the GPS if I go faster than 3 knots the ST 40 shows more speed than actual.
Somewhere around this table :
ST 40 GPS
roughly like that anyhow... I could make it slower but than it wouldnt show anything up to 3 knots...
I have contacted Raytheon and getting stupid answers.. like interface it with my gps in the sog mode. I dont have a raytheon gps but a handheld !!! Or the other one was to adjust the CAL ... which would mean it would show probably 15 knots when I am going 5..
I do clean the inducer every week. The position is somewhat amidships 10 - 15 inches away from the keel.
Thanks ahead for all your hel