![]() Neither you nor they can get the local altimeter, so you can’t shoot the approach. It’s possible you could get all the way to KHQM and have ATC tell you the ASOS transmitter on the field is busted. Note: Watch the NotesThe notes for the VOR or GPS Rwy 6 state that the approach is not authorized without a local altimeter setting. The GPS version shows RW06 just like any other GPS approach. The VOR approach requires timing or DME to identify the MAP. GPS can substitute for DME, however, and D 4.0 should appear as a waypoint when you fly the approach using GPS. ![]() Without DME on board the aircraft, the lowest you could go is 740 feet. The lower one of 620 feet requires that you can identify four DME from HQM. It shows the VOR and DME information instead.There is still an advantage of flying this approach with GPS. Note that because this approach is really a VOR approach that has simply been approved to fly with GPS, it does not show the traditional waypoints you expect for a GPS approach. Other approaches give you the option, such as the VOR or GPS Rwy 6 at Hoquiam, Wash., (KHQM) shown in Figure 18-2. But you can’t fly the approach using the GPS. That doesn’t mean you can’t use your GPS to help verify that you’re in the right place and give you a bird’s-eye view on a moving map. The VOR approaches at KPAE and KPUW must be flown with a VOR as your primary navigation source. You must also be able to retrieve the approach from the GPS database. The approach must say “GPS” somewhere in the title for you to have the privilege of using it. You can’t use a GPS for VOR approaches willy-nilly, however. Overlay ApproachesĪs you saw in Chapter 11, you can enter VOR stations into your GPS, and the GPS treats them like waypoints. These “holding patterns in lieu of procedure turns” (HILPT) are standard fare for GPS approaches. When you returned to OYRED, you would be lined up with the final approach course and could continue on to PORSY and fly the approach. The procedure would be to cross OYRED and fly either a direct entry or a parallel entry as needed. Note that it is not a procedure turn and, therefore, must be flown as a holding pattern. This holding pattern is for course reversal if you are not getting radar vectors for the approach. (See “GPS for DME and ADF” at right.)You see a big holding pattern at OYRED. That waypoint happens to be over an NDB with the same name, but you can use your GPS to get you there rather than relying on the less-accurate ADF. In this case, it takes you to a waypoint called CARRO. Either you see the runway and land before reaching the MAP, or you fly the missed approach.The GPS provides guidance through the missed approach as well. So, there is no timing of the GPS approach. Usually, this waypoint is at the threshold of the runway and is named for the runway. After crossing PORSY, you would descend to 860 feet and look for the runway.The missed approach point (MAP) on a GPS approach is also a waypoint. If you were receiving vectors to this approach, you would be vectored to intercept the line between OYRED and PORSY at 2,000 feet and be cleared for the approach. ![]() The final approach fix (FAF) is also a waypoint. OYRED is referred to as a waypoint and is the IAF for this approach. There is no frequency to tune because the location of OYRED is determined entirely by GPS. The GPS Rwy 23 at Shelton, Wash., (KSHN) is about as simple a GPS approach as you can get (see Figure 18-1). ![]() Lucky for you, the approaches are kept in the GPS database, so it’s pretty easy to get and use them after you know how the system works.You can worry about how to load and activate GPS approaches while flying the airplane a little bit later in this chapter, but you need to review a couple quirks of the GPS approach plate first. You’ve already seen how GPS provides for greater accuracy than most VORs, so why not use it for approaches? You can use a GPS for approaches, but the process is a little more complicated because you must load the approaches into the active flight plan of the GPS. All the approaches you saw in used a signal from a ground-based transmitter. ![]()
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