I just downloaded & installed the freeware NAV3.1 after reading a positive recommendation here on the forums. Slight glitch setting it up initially - 3.1 won't scan my fs2002 scenery (.bgl's), but 3.0 did it without any problem. Now that the initial database is set up, 3.1 seems to work just fine. Except...When I set up a flight plan, I want to choose an aircraft and cruising altitude. Only 28 of my planes are listed, but I have over 100 installed & working fine in fs2002 (lots of freeware). I don't see any mention of the aircraft list in the documentation, no relevant preferences settings, nor any .ini file in the NAV3.1 install directory that I could tweak. There don't seem to be any NAV forums, so I'm posting here.Any other users have this problem and/or know a solution?

AFAIK Nav 3.1 is similar to FSNav and the aircraft flight characteristics are part of the program and are not obtained from the aircraft you have installed in FS.If you want to fly an aircraft not in the Nav 3.1 list and want to use fuel burn, descent & climb profile then you will have to enter them yourself in the aircraft window and save those details as a new aircraft.The above is the way to do it in FSNav and I think Nav3.1 is similar but it is many years since I used Nav3.HTH

Oh, I see. It never dawned on me that the burn, descent, and climb profiles weren't being interpreted from my aircraft.cfg files.I'm still a little confused about exactly where I get that information but I'll dig around a bit in the aircraft.cfg files & see what I come up with. Thanks,

Best way is a test flight.Cruise is easy. Just load up fuel to a reasonable level (depends on aircraft), slew to crusie altitude (with luck service ceiling will be given in aircraft documents), set cruise speed (IAS not TAS) and altitude hold, let things stabalise then pause the sim.Note fuel on board and un-pause the sim at a suitable point on the clock and let it run for 20 minutes and then pause again.Note how much fuel you have used, multiply by 3 and that's your fuel burn per hour.If you want to use true airspeed (TAS) in Nav 3.1 then in aircraft settings change from indicated airspeed to true airspeed, un-pause the sim again and read the TAS)If the aircraft documents show climb and descent rates use those, if not then you will have to do some trial climbs to decide an average climb and descent rate.For fuel burn note your fuel load before take off, and take off time, then pause the sim at top of climb and see how much fuel you have used and what time it took. Divide the time taken into 60 and use that figure to multiply fuel used to get climb fuel burn per hour.Fuel used on descent is usually ignored because it is normally minimal.Once you have all those figures plugged in go for a test flight. Add 10% of the total fuel and however much you want to land with, say 6,000lbs. See how the fuel burn goes, you may need to change the figures slightly.You should aim for not being too heavy when landing but having sufficient fuel for the trip plus your reserve.HTH

Might note that Nav 3.1 works fine in FS9, once you have the daabase from FS2002.scott s..

That's REALLY useful info & very clear. I don't usually like to write a post unless it adds new information, but I wanted you to know your advice isn't being missed or ignored!

Thank you Zapped, glad it was of use.Most of 'us old 'uns' like to pass on what little knowledge we still remember ;-)