TDSXi GTN option?

[dadgametime]

@eker until very recently, the 737 and 767 ran on an INS. Not a GPS. So this makes no sense at all. Russians weren’t jamming INS

[eker]

@dadgametime
No doubt (qualified guess) F28 used the same INS system as Fokker F50. (licensed tech course on F50).
Calibrating updating INS during flight, the system preferred at least 2 DME for triangular calculation, secondary VOR direction. Least preferred was GPS. Great to pinpoint a place on earth but not altitude. The slant range is better with DME/VOR calculation for altitude.

For me - I keep the F28 as is - and wait for F70 and F100.