i've been learning: to start somewhere with latitude and longitude...

It's simple, really.

When starting the program pass in the following command line parameters:

--lat=38.976288 --lon=-76.481801 --heading=90

This starts you in the Annapolis, MD harbor.

Map coordinates can be obtained from: https://itouchmap.com/?r=latlong

And here's a wide angle view of the starting location above: