I recently tried a Garmin, expensive, but gave it a shot. Hoping it would be a benefit in unknown areas. So I took it on a 400 mile trip that I take yearly to see what it would do. The model I tried worked for MC and auto travel, but I couldn't tell what mode I was in, seems like it would be the first thing to choose. Anyways finally decided that maybe it knows by the plug arrangement, they are different , auto is cigarette lighter type, MC was wired directly into the bike.
So the trip, the GPS wanted to change my course to something that I knew was wrong or longer. At one time I was on rt 25, heading east, the GPS turned us left onto rt 115 north east, and I followed it for about 15 miles. Got into another town and the GPS wanted to turn me south, back towards 25, the route we left 15 miles back. I've driven the part of 25 that proceded east at the turn on 115 and it's not a bad road, just adds distance and time for my destination. At one point the gps said we had 2.5 hrs remaining in the ride, that was it's plan, my route got me home in under 2 hrs.
I've since sent it back for a refund. I have a handheld gps that I use when confused in an area or to find a specific spot. I wouldn't waste the money on a bike gps, get good instructions from your computer, I carry my Android, pull into a D&D or similar, rest up and figure out the next portion of my ride. Gives a good rest and refresher too, more fun for me. I love getting back on the bike being fresh again, hop over a couple of towns, 100 miles or so and get new directions, that's how I've been doing it, the gps likes to do what it wants to do, hmmmm,,,, I guess I like to be in charge
Hoopla