Originally Posted by Paul Elliott
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.