Now when you key up on a C4FM repeater - as well as with a few other functions - your location/distance is also transmitted/received for the other stations. And if it makes your day, you get the cool little green GPS satellite icon showing up on the FT-991A touchscreen. Nice!
Update: Oct 2020
With a Powerwerx PowerPole-to-cigar lighter adapter, I plugged this into my RIGrunner 4007U because I kept hitting the plug sticking out the front of the power supply. This GPS is working great!