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#12
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Gig 601XL Builder wrote in
: Bertie the Bunyip wrote: Gig 601XL Builder wrote in news:13prvb8h2m12219 @news.supernews.com: Bertie the Bunyip wrote: What if you are VFR over a cloud layer? There are lots of times that GPS, VOR and even ADF are the primary navigation aids for VFR pilots. Well, there are other, more traditional, methods that are really pretty essential if you're going to do that. 1 in 60 rule, for instance. Determinging drift from aircraft ref points and celestial bodies, that sort of stuff. Bertie Last time I checked celestial navigation wasn't in the PP requirements and use of a VOR was. I know, but going vfr on top is kinda heavy territory for someone with a fresh ppl anyway. How many know the 1/60 rule? Bertie I didn't say anything about someone with a fresh PPL. The person I was responding to (a student) was saying that a non-instrument rated pilot shouldn't be using GPS, IFR... as primary navigation. I've heard the term 1/60 rule but don't know what it is. Well, what I'm advocating is a bit more nuts and bolts nav sense if people are going to start dicing with weather, rather than just rely on GPS, so I think we're on the same page. The one in sixty rule just means, for example, that every sixty miles you are from a navaid, each degree is about one mile. So, if you're sailing along roughly abeam a VOR with no DME, and you know your groundspeed is about 2 miles a minute and you cover two degrees in about a minute, well, you know that that VOR is sixty miles away. If you cover four degrees in a minute, you're thirty miles and so on. It's rule of thumb, but it works well. Likelyise, if you are dead reckoning on top and there is one quick visual reference and you know how far it is off your dsired track since our last known position, you can calculate your drift quite accurately for your next leg. There's a thousand and one uses for it. Cool eh? Bertie |
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