SailNet Community - View Single Post - Calculating true wind
View Single Post
  #9  
Old 01-23-2013
Omatako's Avatar
Omatako Omatako is offline
Senior Member
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,393
Thanks: 0
Thanked 26 Times in 23 Posts
Rep Power: 11
Omatako will become famous soon enough
Re: Calculating true wind

Quote:
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.
Reply With Quote Share with Facebook