Dangleometer? Never heard - but it sounds very much like a sextant. In maritime navigation, the sextant is mostly used to measure the height of a heavenly body (no, not mine
) above the horizon. When used for this purpose, it is held vertically, but it may also be used for lateral measurements, in which case it is held horizontally.
I have - on a holiday trip to France in a SuperCub - used a bubble sextant for naviagtion. But I must admit - it was not the primary navaid
. When all the calcs for 4 stars had been done, I was able to get the lines to intersect with approx 8 NM accuracy. OK perfomance, but the point is - it took 10 min. from the first measurement before the pos. was plotted. This hardly qualifies for P-RNAV departures
Brgds,
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