Now you can easily calculate the Oblique Stereographic projection. It converts an X- and Y- coordinate to latitude and longitude and vice versa.

To do so this Oblique Stereographic projection only uses some parameters:

-latitude of origin
-longitude of origin
-scale factor
-false easting
-false northing

You can fill in all these parameters to get the right calculation and results for the Oblique Stereographic projection.

Besides that you can change the radius of the earth and its flattening. So the Oblique Stereographic projection calculator is a full complete app that forfills your needs to calculate your GPS coordinate to a map.