~S~
There are no radio navigation aids in stock CFS2 aircraft and no NDB beacons in the default scenery.
A pity, because even during WWII there were radio navigation aids available (Huff-Duff, YE-ZB for allied carriers, etc.) and this would have added a great deal to people's immersion in the game. For example, it would have been a lot of fun to be able to turn off the tactical display and navigate for 'real' in missions... Try finding your carrier using the excellent Fox Four 'ADF' (really a modified GPS gauge) in one of their outstanding Korean missions - it's quite unnerving!
What you can do instead is install your own ADF gauge and control into your panel and either add your own NDB beacons using a scenery editor such as FSSC (very easy to do) or install a scenery with them already set up as Bombardier suggests. Steve McClelland's is excellent though I have to say that I didn't really like it because it also placed the flashing beacons in the scenery and I felt they were a tad unsightly and sometimes poorly situated. A personal preference, no reflection on Steve's otherwise sterling work!
Using ADF can be a relatively easy affair - the beacons transmit on a particular frequency. Simply dial in the frequency and follow the signal or use it to help you follow a particular heading by tracking it backwards - provided you are within range that is...
If you have DME (distance measuring equipment) you can also get more complicated and fly blind approaches and holds using ADF/NDB - these can be a bit of a headache to be honest...

The standard civilian FS series ADF gauge (which works fine in CFS2) looks and feels modern so I always felt it jarred a little when placed in a CFS2 cockpit (I simply substituted it for one of the less useful gauges in both 2D and virtual cockpits - engine temperature and what have you - and had a pop up box for setting the frequency which I could get rid of when I wasn't using it). I did find a radio_compass.gau that looked and felt more of the period, but this is some time ago and I'm afraid both the file and location is now lost to me - perhaps some one can dig it up for you.
You can find a simple tutorial on using ADF in CFS/CFS2 here:
http://www.netwings.org/pages/default.a ... vigate.htm and a more involved one here:
http://gryphon.users3.50megs.com/CFS2/Nav1.htmlHope this helps
All the best,
Pads