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Old 14-02-2014, 12:16   #31
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Join Date: Mar 2009
Location: The boat: Cowes (Winter), Above 60N (Summer); me: somewhere in the air!
Boat: Cutter-Rigged Moody 54
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Originally Posted by Paul Elliott View Post

The Ground Wind calculations should also include Heading because, due to leeway, the boat isn't usually pointed in the exact same direction as COG. AWA is relative to the bow, so this will make a difference when calculating Ground Wind. I don't know how many instruments do this, but, for example, NavMonPc (my free program) does this.

For selection among multiple GPS sources, some NMEA multiplexers (ShipModul, for one) will let you select a primary source and a backup. NavMonPc also does this.

I've installed GPS antennas / receivers under the fiberglass deck, and they have worked well. Given the option, I would prefer to have the GPS outside in the clear.
Good point about leeway!

My network is N2K and I have so far been unable to configure a failover from the GPS built into the helm plotter, to the GPS built into my AIS black box. Although I have no trouble configuring the AIS unit as primary position data source.

I guess it won't matter after I acquire the new GPS.

"Parce que je suis heureux en mer, et peut-Ítre pour sauver mon ame. . . "
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