I think your ST60 would normally have an ST800 transducer, which outputs 17000 pulses per nm.
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It is this instrument puts the speed data on the SeaTalk bus, it thinks the square wave is coming from a paddle-wheel. The apparent wind is a vector of true wind and water speed direction. The boat is sailing in the water not driving over the ground. So GPS speed data will be inaccurate for calculating apparent wind. Perhaps that is why they have invented ground wind from GPS data. Id missed the vital bit about the Tridata converting the analogue signal to Seatalk and sending it to the chartplotter and the Wind display. I see that you can buy a commercial converter so I guess that this does the same as your gizmo Its rather expensive (probably 100 when postage included) so I would be interested in building one as a project. It says 22,000 pulses per nautical mile and doesnt seem to need any calibration to achieve 0.01 knot accuracy. Presumably if the Tridata receives those 22k pulses over 12 minutes it calculates a speed of 5 knots, although that looks like a frequency of 4.4 KHz per knot which would be variable depending upon speed so that looks different to your gizmo Richard. All the speed data comes from the GPS as I have no speed paddle through-hull on this boat. The first thing which puzzled me was that the wind instrument has a button for Apparent Wind or True Wind. Having read this forum and others over the years, I know that the ST60 will only make the True Wind calculation from paddle wheel speed and not from GPS speed so I can forget about that. Richard. This combination with a separately powered ST60 set up means that I dont need to turn on the C80 unless I need a radar in fogmist. I prefer my stand alone SH chartplotter for fair weather sailing). Cheers Bob. Raymarine St60 Wind Service Manual To EvenPersonally, I find the Raymarine mind set far more difficult for my brain - I ended up writing my own interpretation of their operating manual to even stand a chance of getting sense out of the radar Good luck with what you decide. The instrument has sufficient calibration range to use 22000 pulses per nm.
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