GNO

 Projection     : Gnomonic
 Also known as  : Gnomic
 General class  : azimuthal
 Characteristics: neither conformal nor equal-area
 Earth model    : sphere

Defining the MAPUNITS:

 MapUnits "gno"      ! Standard name
 MapUnits "gno e19"  ! Standard name and ellipsoid

 TrueOriginLongitude "longitude_of_origin"  ! Required, for True origin
 TrueOriginLatitude  "latitude_of_origin"   ! Required, for True origin
 FalseEasting        "false_easting"        ! Optional, default is zero
 FalseNorthing       "false_northing"       ! Optional, default is zero

Possible errors:

 E334, "Point cannot be projected" - In converting from geographic 
        coordinates to projection coordinates, the point projects 
        into infinity