Join Date: Feb 2010
Location: Narragansett Bay
Thanked 593 Times in 569 Posts
Rep Power: 12
Re: GPS determined speed
SOG, or better VMG, are what I use for efficient navigating. Deciding whether to tack/jibe, take wave action on the nose or beam, move to better current, etc. You are right, current tables are, at best, accurate at a specific spot. Move closer to land, or a turn, or deeper/shallower water, and itís different. Perhaps the only thing I believe is fairly accurate across the spectrum is the direction of current.
I only use STW to see the efficient result of sail trim, given wind speed and direction.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
In the harsh marine environment, something is always in need of repair. Margaritas fix everything.