I think you might have some issues with DME service volumes, though. Not to mention you'd be right over it and it would still run out of decimal places. You can see the entire continent, though, do you really need DME to tell you where you are?
I got to "fly" the SAFER pack simulator at Johnson Space Center, right after Piers Sellers got done. Getting back to the airlock was a lot like landing a plane once I got used to it.