Currently, the JTAC by default gives coordinates in MGRS, while the Viper DED only takes lat/long.
I'm not sure the Viper can actually work with MGRS IRL, but either that would be nice to see implemented or if not, for the AI JTAC to call out lat/long instead of MGRS.
I know there are mods for this, but I think this should be the default in the game.
Oh and the Wingman/Flight being able to work with AI JTAC too would be awesome.
Completely unrelated side note: the wingman should not be calling out every single ground unit as a contact on the radio, maybe groups of ground units would be much better.