"M.Lopresti" wrote in message
...
I have never really seen the terms used with light aircraft flight
planning (G.A), only with heavy aircraft flight planning. Whats the
difference between GNM and ANM?


A trip of 100 nm over the ground, in an hour, if into a 10 knot direct
headwind, would be a trip of 110 nm relative to still air. For logical
range calculations, the ANM concept is necessary.

John Lowry
Flight Physics