The GAT-1 for rapid calculations of Drift and Ground Speed etc. A plastic circular calculator of 115mm in diameter for aircraft with cruising speeds between 90-130 knots. Coloured scales and a clear rotating Wind Arm make the instrument particularly simple to use for fast computations of Drift and Ground Speed corrections. Mag...

The IPC-1 for multiple Navigation and Instrument Flying calculations. A circular 115mm diameter calculator. Circular Slide Rule side is that of the CRP-1 without a cursor. For calculation and conversion of Temperature, Time, Distance Volume, Altitude and Density Altitude, Speed, Weight, Fuel, Multiplication and Division, 1 in ...