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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Researchers spoof GPS signals to alter superyacht'scourse
From: Bill B
Date: 2014 Apr 29, 14:49 -0400
From: Bill B
Date: 2014 Apr 29, 14:49 -0400
On 4/29/2014 2:21 PM, Peter Smith wrote: > Hear, hear! for the trusty hockey puck > (http://www.celestaire.com/compasses/mini-2000-compass-detail.html) I would not leave shore without my hockey puck, and IMHO the Mini 2000 is the best of the lot. If memory serves at the time I purchased mine Celestaire carried two hockey puck compasses. I was fortunate enough to chat with Ken in Celestaire's booth at a Chicago's Strictly Sail show, and the Mini 2000 was his recommendation. I bought it on the spot and have never looked back. I've used it along with a sextant 17 miles off Chicago. In one set I used the horizontal angle between 2 skyscrapers determined with the sextant and a bearing to one from the compass. In another I used vertical height above the horizon with a modified refraction value along with a compass bearing. The results compared to GPS position were so good it was almost scary. In one set I used height above horizon and a bearing (true) from the GPS, and it was worse than the compass observations; perhaps because the GPS is limited to 1 degree resolution and on a good day the hockey puck can do better than that.
