Our UNS-1K displays xxxT/xx, so it's True winds.
As far as I know, the only Mag wind data is at aerodromes.
Our UNS-1M does likewise.
And, our Honeywell HT9100...and the Hamilton Sundstrand FMS (original fit, circa 1977).
Get a grip, folks...winds aloft are TRUE, at the airport, magnetic (normally).
Rocket sceince it ain't...despite what some 'new' pilots think.
