I noticed when I upgraded to fgfs 0.9.9 there seems to be support for
TACAN now, but I can't figure out how to get it to function.  Does it
work?

FlightGear/Navaids$ zgrep HIF nav.dat.gz
12  41.120503 -111.963681   4806 11120   0.000 HIF  Hill TACAN
4   41.104047 -111.959581   4775 10990     152.980 IHIF KHIF 14 LLZ
6   41.137167 -111.980497   4780 10990  280151.963 ---  KHIF 14 GS
8   41.149389 -111.990497   4560     0     151.963 ---  KHIF 14 MM

If I set the DME freq to 111.20 I can read the HIF TACAN DME.  Looking
up that freq in TACAN_freq.dat yields channel 025Y:

FlightGear/Navaids$ zgrep 11120 TACAN_freq.dat.gz
025Y    11120

If I set the TACAN to 025Y near HIF /instrumentation/tacan/in-range
remains "false"

Web sources suggest the TACAN at HIF is channel 49.

If I set the TACAN to 049(X/Y) near HIF /instrumentation/tacan/in-range
remains "false"

Found these pages: 
http://microvoltradio.com/tacan.htm
http://www.angelfire.com/mb/amandx/vuhffreq.html

I guess the numbers in TACAN_freq.dat are in 100s of KHz instead of 10s
of KHz like in nav.dat.gz.  So channel 49X is 1,010.0 MHz not 101.00 MHz
like I was reading it at first.  It seems the 111.20 MHz DME in
nav.dat.gz is correctly assosciated with TACAN channel 49X, and
FlightGear treats it like any other DME, which I guess it is.

Is there a way in FlightGear to pull the DME freq from a TACAN channel?

Is there a way to get data into /instrumentation/tacan/ ?







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