Twin Engine Rotary and Fixed Wing Indication: Do we need it?

Engine indication in detail with the BO 105 and King air.

[@jimmydesouza4375]

Why is navigation predicated on GPS prohibited?

[@MrSkidkicker]

Sorry Jimmy. I don't know the answer to that.

[@cobra646]

Likely a combination of the hardware (we'd call it vintage now) its installation, and the regs at the time, GPS could only be used for situational awareness, not for primary navigation.