RADI

Забавная вещица.. Еще не пробовал, но описание заманчивое..

FS2004 Radio Altimeter/Drift Instrument (RADI). This mechanical gauge shows low altitude and wind drift information in an analog display. It presents this important landing data in a precise and readable manner. Altitude range: 0-1000 ft. Below 100-feet, the altitude needle is accurate to within one-foot. Drift angles: 0 - 30 degrees left/right. This gauge will assist with landing all types of aircraft, but in helicopters it also facilitates hovering and taxiing. By Glenn Copeland.
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