hello captains so here, i'm going to explain direct GPS, vs high/low alt airways. so basicly, when you switch your navigation devices to GPS (auto-route-following) your autopilot will take the lead when you do "auto pilot on", you will turn on your main auto pilot system, which controls the, navigation systems (heading, corse, GPS), altitude, virticle rate speed, your airspeed (by ajusting the throttle automaticly) your engine temprature, your trims. here, we have the auto pilot on. now on navigation GPS. when you make your filePlan with FS, FS will draw a route on the map for you. from your departure to your destination. now. when you select "direct GPS", fs will draw this route, directly from your departure to your distination. by direct i mean you don't have any turns, or intersections in your route. so when you cruise, you will head directly to your destination without changing headings on the air (when your GPS is on.) saying this, if you choose direct GPS, then when you switch your nav GPS on, if you ask michel "get the directions to the airport", she replys with "the airport is at our 12 ocl" it means that you're heading directly to your destination. (in the real world, 90% of the times pilots are not allowed to do this, it will ruind the traffic, and the aircrafts will crash to each other if they all fly direct) now when you choose "high or low alt airways" fs will draw a normal (depend on the world routes) route for you, with intersections, and some turns in your cruise way. like, when you go over of some waypoints, you will change headings slightly, and follow the road. your NAV GPS will lead the aircraft, turning left and right on the air ways. so with all of these, i hope i could explain the diffrense to you, and how the navigation GPS works. note: GPS doesn't exist in real world. in real world, there is a FMC (flight management control) installed on all aircrafts, and when a pilot fills all the information that FMC needs, FMC will lead the aircraft on cruise, like the GPS thing which we have. if i couldn't explain this thing, or my sentenses didn't make sense, please tell me so i might be able to do this. after all, you need to know what are you doing in the aircraft instead of just sitting and say soem commands repeatedly. ron said that there might be other options. so basicly, "FMC" "manual nav, which you should change heading yourself when you can see the map visually, or sometimes the ATC will give the headings to you if you want". you have this mail from hadi From: kolesar16417@xxxxxxxxxxxxxx To: bvipilots@xxxxxxxxxxxxx Subject: [bvipilots] Re: Direct GPS navigation, or high Altitude Airways? Date: Sun, 27 Nov 2011 12:05:30 -0500 I always make sure that my nav GPS is set to GPS. Never heard of the other options. HTH. From: Tony Sent: Sunday, November 27, 2011 10:45 AM To: bvipilots@xxxxxxxxxxxxx Subject: [bvipilots] Direct GPS navigation, or high Altitude Airways? Hi All Is there an advantage to using either of these? Also, I’ve noticed that when plotting a route in flight planner using high altitude airways, the waypoints can consist of intersections and VOR stations. Is it necessary to do anything when the next waypoint is a VOR, or will the aircraft magically go on its merry way. T Ron and current Leader Dog boz who states "that a service dog beats a cane hands down any day of the week."