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Search took 0.00 seconds. Search: Posts Made By: Paul Elliott
Forum: Navigation 02-10-2018, 22:34
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

And it sure isn't an oven or a microwave. These may provide some protection from lightning-induced fields, but they are far from sealed. The door gaps in particular will let through a significant...
Forum: Navigation 27-09-2018, 17:15
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

Pretty easy if there isn't any fog.
Forum: Navigation 27-09-2018, 14:57
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

Yes, I was thinking of a back sight, giving a reading greater than 90 deg. As you point out, because of the limited sextant angular range this won't work at all in latitudes further south than 60...
Forum: Navigation 27-09-2018, 13:28
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

Could you take two sights of Polaris, first one using (say) the northern horizon, and then the second using the southern horizon? Average the two measured heights to get your latitude. This would...
Forum: Navigation 20-09-2018, 11:37
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

I'm not claiming I use the thing (not since since high school), but the slide rule is in my desk, as a backup to my HP 15-c calculator. Which is a backup to my computer, you know, in case of the...
Forum: Navigation 20-09-2018, 09:54
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

Trig tables? My slide rule has a couple of trig scales, although I suppose to get the required accuracy would be a chore. You couldn't read the result directly beyond a couple of significant...
Forum: Navigation 19-09-2018, 13:54
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

I can't find any references to Iridium orbit changes, and I can't recall where I thought I heard that. Perhaps I misunderstood. And your point about the orbital mechanics does make sense.
Forum: Navigation 19-09-2018, 13:36
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

I sincerely doubt that happens anymore, I flew out of Hawaii for the Coast Guard from 2003-2006 and GPS was approved for en-route guidance in IMC, which couldn't have been the case if they were...
Forum: Navigation 19-09-2018, 10:56
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

Local GPS is occasionally degraded or disabled when the U.S. Navy is having large exercises around the Hawaiian Islands. They announce this well beforehand.

I also heard that some of the Iridium...
Forum: Navigation 18-09-2018, 13:02
Replies: 177
Views: 17,141
Posted By Paul Elliott
Re: Considering these ideas of navigation.. What is your opnion on it?

I figure that if I lose my GPS and clocks, I can still do noon sights (with sextant, a calendar, and the Almanac) and run down the latitude until I see land. Not that I expect to need to do this...
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