SailNet Community - View Single Post - Calculating true wind
View Single Post
post #9 of Old 01-23-2013
Senior Member
Omatako's Avatar
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,705
Thanks: 1
Thanked 36 Times in 33 Posts
Rep Power: 14
Re: Calculating true wind

Originally Posted by MarkSF View Post
The GPS does not provide heading, it only provides course. It's dumb, in that it thinks the boat is pointing in the direction it's going....
Sorry I don't agree and go as far as saying that reality is diametrically opposite to your description

If the boat is effectively stationary and drifting on a tide, the GPS will give an accurate reading of the direction and speed of the boat's movement. GPS is far from dumb.

Equally if you are sailing a compass course of say, 165 degrees and there is a 090 degree current setting, the steering compass will read 165 (assuming it is accurate) and the GPS will read a vectored course including the current drift.

In other words, the compass will tell you where the boat is pointing and the GPS will tell you where you're going.

And I agree with Tommays - what you're trying to do is beyond the realm of a pocket calculator.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."

Arthur C. Clarke

Last edited by Omatako; 01-23-2013 at 11:46 PM.
Omatako is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome