Discovered BitBar today and thought it would be useful to display GPS coords in the menu bar. I use them a lot when testing lat/long pairs, plus it's neat to see when you're on the road.
You need to download an executable called whereami to get your location. It's open source and uses the OS X CoreLocation framework.
Once you have that in your home directory, just put this small script in your BitBar plugin directory, chmod +x it, and you're done.