also: だいけんず
gnomonic chart; great-circle chart; great-circle map
A specialized cartographic term for a chart or map on which great circles appear as straight lines, used in navigation and geodesy.
Great-circle charts are used to plan the shortest routes for aircraft.
The navigator decided the course while looking at the gnomonic chart.
Standard kanji spelling; the reading たいけんず is more common than だいけんず.
Alternate reading; less common and may be considered non-standard in some contexts.
Compound of 大圏 (great circle) and 図 (chart, map). The term is a direct calque from English 'great-circle chart' or 'gnomonic chart'.