SailNet Community - View Single Post - GPS Accuracy - how much is actually needed
View Single Post
post #36 of Old 03-05-2014
Join Date: Apr 2006
Posts: 12,399
Thanks: 6
Thanked 184 Times in 181 Posts
Rep Power: 13
Re: GPS Accuracy - how much is actually needed

Let's see. With a chart scale of 1:25,000 and a common 0.5mm mechanical pencil, unsharpened, that pencil line would be 25,000 x 0.5mm wide in the real world. 12,500mm at 1000 mm to the meter, 12.5 meters wide.
But if you buy that mechanical pencil at a real supply store it can easily be 0.3mm lead, giving us 25,000 x 0.3mm, which will be 7.5 meters wide in the real world.
I'm not sure if you can sharpen a conventional pencil to a finer point.

Of course if the navigator is using a vintage 5/0 or 6/0 Rapid-O-Graph, they can do twice as well as that.

Personally I prefer the safety zone created by a nice dull Crayola Crayon. (G)

But back to the OP's question: Offhand, anytime you can increase accuracy or precision, that's a good thing. What they are seeing is a signal degradation caused by the hull and deck, and that probably will increase under heavy rain and cloud cover. Ten meters, twenty meters..."Good enough for government work."
hellosailor is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome