You are right; how could I have been so lax.
I meant to say "I locate myself using a pencil and a parallel ruler to mark a position on a chart showing latitude and longitude, while my GPS locates itself in Earth Centered, Earth Fixed Cartesian coordinates, using meters as a unit and then displaying its position in latitude and longitude entirely for my conveninece."
And then I would have checked my spelling, just to make sure I would escape all criticism, and corrected any errors that I noticed.