As far as I know, only Waypoints, Mission Points and Mark Points will show on the TAD.
I do not believe a TACAN station will show up all by itself without being one of the above.
Because the nose wanders constantly in both roll and pitch in unaccelerated flight.
For me, the Viper simply will not trim hands off and neither A/P mode will hold it straight and level. Altitude Hold requires Roll trim and Attitude Hold needs help holding a specific pitch.
Some servers have maximum ping allowances.
Many servers insist on “pure clients” (ie No Mods / Only Approved Mods)
How’s your ping and are you running any mods?
Sure there is...
Add a strong north wind when you're trying to maintain a ground track of 090.
Your nose has to crab north of east in order to hold that ground track.
In Wags’ IFF video, he hit the Emergency Jettison to drop his tanks so is it possible you punched off ALL your ordinance? It’s not Selective Jettison, yet...