Not sure about the latitude and longitude, but maybe this would meet your needs? http://bubblergps.com/

Neil Gaiman

deleted by creator

I’ve been using a displaylink for 3 years now, mostly on Ubuntu and the past 8 months with endeavours/arch, but I don’t have the Nvidia. For me it has been the delicate art of managing updates to the kernel/evdi/displaylink packages. If one gets out of sync, I lose the use of my extra screens. If you want stable, only upgrade any of those three after checking very carefully. Typically I’ve seen displaylink support for the newer kernels lag a little behind, or an evdi update that breaks displaylink until they catch up.

If you’re more adventuresome, you can just learn how to back up to known working versions of those packages that play nicely together until they are in sync again.