SOG (akak GPS speed, aka speed over ground) is useful to tell you how long it will take to get to your destination. Speed through the water is what you want for sail trim or checking engine performance. If I let the main out 12 inches while sailing back from the side of the river to the center with a fair tide I might well show a gain of 1 knot on the GPS because I am in a stronger current even though the boat is sailing 1 knot slower through the water because my sail trim idea was wrong. You can sail a boat with no instruments at all, but is nice to know what is going on.
Joe Della Barba Coquina From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Curtis Sent: Tuesday, January 14, 2014 7:31 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Autohelm St4000 how it should work with the GPS All that being said, how much does this speed help you anyway? I mean it will tell me how fast the river is passing under my boat but not if I'm making speed? The GPS tells me distance over the ground, I have been sailing real good before and not making much distance over the ground. What are your thoughts on this? I will hook it back up and try it tonight after work. But if there is no activity on the meter It may have a bad wire or something. Thanks for you guys helping me out. I take no offence I know I'm green at all of this and expect a bit of new guy jokes and slapping around. It's all good with me I'm just glad to have someone to ask help from. I am very glad you guys are her. Curtis
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