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#21
posted to rec.boats.electronics
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True "true wind" & the Raymarine ST60, or other
I don't understand the reference to the paddlewheel rgnmstr. True wind
direction = wind direction (true north) if the boat was anchored at a point on the water, e.g. not relative to the boats movement or water current. To achieve this (with the boat in motion), you need the apparent wind & speed, SOG (from the GPS) and ship heading (true north) from your flux gate (COG from GPS introduces error) to get a close approximation, and a little more accuracy can be had if you include adjustments for angle of heel error, heading error (compensate for mast & sail induced air flow), a yaw sensor on the mast, etc ... oh yea, and you need an instrument package that uses this, some like Raymarine wont use SOG from the GPS. |
#22
posted to rec.boats.electronics
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True "true wind" & the Raymarine ST60, or other
Interesting paper published that explains true wind, and notes that 80%
of marine vessels calculate it wrong. http://www.coaps.fsu.edu/woce/truewind/paper/ |
#23
posted to rec.boats.electronics
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True "true wind" & the Raymarine ST60, or other
Better squeeze up for the Brooks & Gatehouse...
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#24
posted to rec.boats.electronics
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True "true wind" & the Raymarine ST60, or other
I have an open suggestion to Raymarin to incorporate COG as an option,
which would make me happy. The rest of the capability is overkill for me (adjustments for angle of heel error, heading error (compensate for mast & sail induced air flow), a yaw sensor on the mast, etc.) |
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