HiDoes anybody here know how to fly a GPS Approach? If it helps, I know how to make an AP-assisted ILS approach. I know how the AP works and I know how to use the nav/gps switch.From what I understand, here is how it works:Copied from an ILS Approach Tutorial, landing at KALB Rwy 01Dial the ILS freq into Nav1, and then: 1) Click 'PROC' button ('select Approach' will be highlighted)2) Click 'ENTER' button (ILS 01 will flash)3) Click 'ENTER' button ('Vectors' will flash)4) Click 'ENTER' button ('Load' will flash)Now DON'T click 'ENTER' button - click big white arrow on top right of 'cursorbutton. ('Activate' will flash)5) Click 'ENTER' button (page of approach setup will display)6) Click 'FPL'button (main map display) ATC again: "Orbit you're 25 miles south, turn left Hdg 040, descend and maintain 2500ft - clear ILS runwy 1......." Now tune altitude numbers to 2500ft and vert speed to -1200ft/minClick 'NAV' hold button(light will be on).A/c will now turn right by itself, following the GPS vectors that you've set up earlier.Is that it? Once you have the AC follow the GPS vectors, can you just sit back and relax? Does the GPS approach have a glideslope? I've checked Google, but it still didn't make any sense. Answers in plain English, please!

Are you using the default GPS or RXP?regards,Igor

Default GPS

Are you using the default GPS or RXP?regards,Igor

I think there is a "GPS" approach, and then there is using a GPS to assist in other approaches (for example, GPS in lieu of DME). GPS can never replace a localizer in either localizer or ILS approach. Note that in ICAO countries, the term GNSS is used instead of GPS.In the US, for historical reasons there are three types of GPS approaches:GPS overlay -- approach uses conventional radio-nav approach, but using the GPSGPS -- not created any more RNAV(GPS) -- current system, used with both RNAV systems and GPS systems. Note: FSX will list both RNAV and GPS approach in the GPS and ATC menu.So first step is to request the GPS 01 approach from ATC. You can get vectors or also request one of the 5 transitions. Either way, GPS does not provide vertical guidance, so you must observe the charted altitudes at waypoints (including step-down fixes). Once you request the vectors or transition to the GPS 01 approach, ATC will clear you to the entry point at an appropriate altitude. You should load the approach in the GPS and activate when ATC gives you the clearance. You should set your NAV/GPS switch to GPS to get GPS guidance to your deviation indicator. The GPS will auto-adjust the deviation sensitivity. You can couple the AP to provide lateral guidance using the NAV mode (if it exists on your AP).Note that the GPS will give you some vertical info via the VSR window, but it is programmed for feet per sec, so you need to mentally convert a reading of -5 to 300 fpm descent, -10 to 600 fpm descent etc.I suppose you can tune the ILS, but if the ILS is working I'm not sure why you would shoot the GPS approach.There are also freeware and payware GPS systems that provide an advanced feature of vertical guidance. In the US/Canada it is called WAAS (ICAO it's SBAS). The idea is that your WAAS equipped GPS receives additional data from the GPS satellites, as well as advanced GPS accuracy checking (called RAIM) which allows you to trust the vertical altitude info from the WAAS GPS. This allows for a lower minimum on the approach, as well as continuous descent. scott s..