got into a discussion at the old watering hole tonight about the base
altitude of the hemispherical cruising altitude( you know, 3000 agl). but
the question came up what do you do in mountainous terrain where the ground
elevation can change thousands of feet in just a few miles. how do you
determine the lowest cruising altitude in conformance with the
hemispherical cruising altitude when the ground elevation is always changing
by thousands of feet?


tony zambon
grumman 9941L