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On Jun 26, 12:59*pm, Mxsmanic wrote:
From Phoenix to Casa Grande in a Cessna 152 in my sim: The aircraft contains only a single VOR, without DME, and an ADF. There are a couple of VORs nearby, including PXR at Sky Harbor, and Stanfield about 8 miles southwest of Casa Grande (connected by V105/J92). There's also a NDB at Chandler, about 19 miles north. What is the most elegant way to navigate from KPHX to KCGZ? I thought it would be good form to follow V105, so after a west departure from Phoenix, I flew east to join the PXR 163 radial. It was hard to judge my distance from the VOR, though, as the desert looks pretty monotonous, and there are numerous small airfields in the area. After flying for a while, I decided to tune the CHD NDB and try to figure out an intersection that would place me over the field. Constant adjustment of the ADF card for this purpose was awkward, though, and did not improve my confidence that I was going the right way. The 152 is very pokey and I always have the impression that I've gone further than I actually have. Finally I got nervous and turned east to pick up the PXR148 radial. I had flight following and Center knew my destination, and ATC asked me what I was doing after I made the turn, since apparently I had been headed straight towards the airport. I explained and when ATC told me where to look for the airport, I turned that way, and after a minute or two I spotted hangars at Casa Grande. This does not seem very elegant to me. What is the best way to navigate this route under these conditions? Exclude pilotage, since this was an exercise in navigation by instruments despite being VFR in VMC. (If I had been using pilotage, I would have simply followed Interstate 10, which practically leads to the ramp, but I deliberately avoided looking for the highway.) I conducted the flight mostly at 3500 feet, although I suppose that's not very important here. I would've climbed a bit higher, for safety, in that terrain. You can exclude pilotage, but it doesn't sound like you created a navigation log before your flight. Even when following the VORs, airways, etc, you need a basic nav log to predict and keep track of your position throughout the flight. I think Flight Simulator has this function(?), but you should make it by hand, if you've never done it, to help understand how it works. With the Nav log, you wouldn't try to "...judge my distance from the VOR..." by looking for it; you'd know approximately when you were going to cross it by looking at your clock. I don't think I would have followed V105 in this case, I would've just followed the appropriate radial outbound from PXR VOR, followed my position using the clock and my nav log, checked my position about midway by switching my VOR momentarily to either of the neighboring VORs, then watched the clock again to make sure I didn't fly past the airport. But the key to all that is the nav log you make before your flight. All the times and positions of the key points, including the midway waypoint is on the log, then you just follow along. If your planned waypoint doesn't appear at the proper time, then you take measures to reestablish your position. By the way, Flight Simulator is perfect for this kind of practice. |
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