![]() So my first question is this: Are you able to load a precision approach from the navigation database into the GPS and fly off that? This approach information should not be confused with a GPS overlay approach (see the receiver operating manual, AFM, or AFM Supplement for details on how to identify these approaches in the navigation database). The navigation database may contain information about nonoverlay approach procedures that is intended to be used to enhance position orientation, generally by providing a map, while flying these approaches using conventional NAVAIDs. ![]() Only approaches contained in the current onboard navigation database are authorized. ![]() Other previous types of overlays have either been converted to this format or replaced with stand-alone procedures. These procedures are now identified by the name of the procedure and "or GPS" (e.g., VOR/DME or GPS RWY 15). The GPS Approach Overlay Program is an authorization for pilots to use GPS avionics under IFR for flying designated nonprecision instrument approach procedures, except LOC, LDA, and simplified directional facility (SDF) procedures. Then I went back and read the blurb on the GPS Approach Overlay Program:ģ. Flying point to point on the approach does not assure compliance with the published approach procedure. This approach information should not be confused with a GPS overlay approach (see the receiver operating manual, AFM, or AFM Supplement for details on how to identify these procedures in the navigation database). Do not attempt to fly an approach unless the procedure is contained in the current, on-board navigation database and identified as "GPS" on the approach chart. So my interest was piqued by this discussion and it caused me to reread the GPS section in the AIM and I see where it states that:Ĩ. So you cannot file an airport as an alternate if the approach you plan on using requires DME or ADF if you do not have these in your aircraft. In addition the non-GPS approaches on which the pilot will rely at the alternate cannot rely on GPS. A non-GPS approach must exist at the alternate when one is required. One thing that is often overlooked is in the 'Restrictions' and it deals with alternates. DO NOT SELECT THE 'APPROACH' in the GPS!Įverything you need to know about using the GPS in lieu of DME can be found in section 1-1-20 of the AIM and I suggest that anyone using a GPS must read this. If you do this, there is no difference to the pilot when flying the approach compared to using DME. The only legal way to fly a DME arc on a VOR only approach is to put the VOR in the GPS as the 'to' waypoint. It is only legal to do this if the approach is titled "VOR or GPS", you cannot fly a DME arc like this unless the approach has "GPS" in the title. If you select the approach and use the DME arc as the initial fix it will automaticly sequence you through. The DME arc for any aproach is already loaded in the G430. Related, but: True or False: As long as the panel mounted Garmin 430 GPS is approach certified, I can legally use it in place of DME for arcs. With the Garmin 430, will it be acceptable to simply turn the appropriate direction to keep the distance readout where it should be? I.e., if my DPE wants a 15 mile arc, do I just turn in the direction of the arc and keep the readout as close to 15 as possible? ![]() It was a series of small turns, but I got to be pretty good at bracketing a DME arc. I'd lead the turn to my FAC, and all was well. I'd tune in and then center the appropriate radials, usually 10 degrees at a time, until I had flown as far around the arc as I needed to go. Then, I'd turn in the appropriate direction to establish myself on the arc. In prior aircraft (I took my Instrument checkride in a Civil Air Patrol 182 with DME but no RMI), I'd fly outbound on a radial until I got to half a mile or so before the distance of the DME arc. The ATP A/C have no DME, but do have two Garmin 430s. I'm training for a CFII checkride, which I intend to take in an ATP Piper Seminole. ![]() I'm hoping that this one falls under the category of a no brainer, but I want JC opinions. ![]()
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