| 摘要 |
PROBLEM TO BE SOLVED: To safely attain low altitude flight even in a bad angular range of the view. SOLUTION: A memory 4 stores terrain data (a) showing the height of the ground surface and ground object data (b) showing the height of an object existing on the ground surface at each coordinate data A of a route in advance. In the middle of flight, a CPU 2 compares the altitude of the aircraft itself measured by a measuring means and terrain data aL and ground object data bL at a position advanced by a previously fixed distance in an advancing direction C from the present position A to output a alarm on a display 3 when at least one of aL+Δ>=B and bL+Δ' >=B (Δ,Δ' are fixed values showing the margin of the limit of flight altitude) is satisfied.
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