Currently I'm using google maps, but I'm going to add openStreetmap as a option.

Right now there is just a button you press that opens google maps externally at the selected 'crag'.

I'll add a dialog there that lets you choose the default application to use.

I might also integrate the map directly into the application, if I do then I'll integrate OpenStreetMap and not google maps, but let people use google maps as 'external' map viewer if they want.