@bradkp, I suspect since you have multiple items that failed at once you have a grounding issue.
If you look behind the series of switches, you'll notice there is a common ground that runs from switch to switch in a series. Are all of the devices that are now not working aligned one after another on your electrical panel?
If so, check behind to see if a ground has become loose.
Was the GPS added aftermarket? If so, was it tied into a common ground?