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Yet more GPS substitution questions
Yet another GPS substitution question...
It's a given that you can't use GPS to shoot an approach labled "ADF blah" unless it says "ADF or GPS blah", but how do the alternate rules really work? The regs say that I have to have an approach that I'm equipped for other than GPS at the alternate airport, like an ILS. Am I correct in believing that if you need the GPS for DME, or to identify missed approach holding points on the ILS, you still can't use that as an alternate because the GPS is used in some way to complete the approach? Secondly, how about shooting this approach (VOR/DME 21 at Minuteman - Stow, MA) - http://avn.faa.gov/d-tpp/0501/05764VD21.PDF . Assuming that I'm shooting this as a primary approach (not my alternate), and the aircraft doesn't have DME, what can I do with this approach? Wouldn't I technically have to fly the approach with the HSI in VOR mode (it doesn't say VOR or GPS, it says VOR/DME, and without an overlay the GPS is only advisory)? But the DME is based off of the MHT VOR. If I load the procedure into the GPS and go past the 'not a gps approach, only advisory use' warning, now my distances are going to be based on the waypoints the system loads up - EGORE, RW21, EGORE. Since loading the approach for non-GPS or non-overlay approaches does come up with the "advisory only" warning, how does it work to legally use the GPS on this approach? It's not giving me DME from MHT, it's not even giving me DME from EGORE, it's giving me DME to RW21, a non-five-letter name waypoint (which should be coincident to the threshold of the runway, and thus 25.1NM from MHT), but with the "advisory only" warning, course guidance coming from the VOR, and the distance references coming from something other than the DME origin for the approach, how does this approach work? I'm sure I'm missing something here, just curious what it is. TIA. |
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