Re: Night Sailing navigation


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Posted by Jon on April 12, 1999 at 18:24:30:

In Reply to: Re: Night Sailing navigation posted by Dave W on April 12, 1999 at 07:03:13:

Actually, the instantaneous errors seem to be worse at low speeds; they become a larger part of the apparent displacement. At higher speeds, the SA component becomes much less than the actual motion. It's interesting to sit on the front porch and watch the house (apparently) sail around the neighborhood at 2-3 Km/Hr in random directions. I usually use my GPS in connection with a mapping program on highways and the line usually stays close enough to the road that I'm sure where I need to turn next (One driver, one navigator! - don't try to do both jobs yourself kiddies!). Hiking, I notice a good deal more wandering, even when I'm on a straight stretch of trail - very zig-zaggy. Of course there you suffer from loss of signal due to tree cover. I haven't had occasion to use it sailing.
I quite agree, in WDMTGTS it would have helped them locate their position more readily. Even with a marine GPS with "anchor-watch" setting, they probably wouldn't have realized they were dragging until it was too late, but they might have been able to start heading back into the harbour before the storm came up. Of course, that might have compounded the problem, because then they would have had to reach across during the first part of the storm!
We're seeing NVG equipment in all sorts of places in the US - much of it of Russian manufacture. Sporting goods stores, outdoor and general merchandise catalogs, etc. Actually not so much goggles as telescopes or binoculars with image intensifiers.


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