Garmin and truck Nav

[Shawn O'Leary]

This is an odd one. I play a decent amount of golf and typically keep a charger for my Garmin golf GPS watch (tells me yardages to hazards and greens and the like) in my vehicles. Now that its getting nice enough to play I finally have the watch in the truck. But anytime I plug the garmin charger cord into a USB port and charge the watch, the truck tells me the Nav SD card has been removed and the truck's nav won't work. I unplug the watch and the nav functionality returns. I've tried this multiple times on separate days and with different USB ports. 

 

Obviously its not going to be a common problem and I highly doubt GMC has a solution for this. I did email Garmin and they say the charger cord is for power only; the watch is not set up to transmit or receive any day through the charger. So it shouldn't be an issue with the watch sending anything to the truck. Still, this only happens with garmin. I've had multiple devices plugged in at the same time and this doesn't happen.