Abstract
The oblique or general case of the gnomonic projection receives little serious attention in most text books on map projections and in the works which do include the theory it is unfortunately developed with unnecessary complexity. In consequence it is much less widely understood than are the special cases represented by the polar and equatorial forms. Yet the oblique form provides a gratieule which has proved incomparably more useful than either of the two Inore obvious and popular special cases. Thus, oblique cases have provided the graticules for the series of gnomonic charts of the oceans published by the Hydrographic Department of the Admiralty; the G.S.G.S. Consol Plotting Charts and the Gnomonic Fixing Chart (prepared specially for use with long range radio aids to navigation) are all oblique gnomonic graticules as are the special purpose charts for position fixing from radio bearings published by the Admiralty. In addition, all large scale port plans included in the range of Admiralty charts are drawn on a modified gnomonic. It is only in connection with the production of facets for “near globes” that one can point to the use of the polar and equatorial cases of the gnomonic and even here the greater number of facets are produced as oblique cases.
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