After an update to my Garmin awhile ago, it added an exclusion for "unpaved roads".. If you didn't check it to "exclude" them, it would take you on unpaved roads! Found this out while towing the trailer. We knew the way to go but the GPS kept telling us to go this other way... Well, got curious and decided to follow it.. It wasn't so bad initially.. Ended up on some wide gravel roads, but it kept telling us to "turn right". Well, "right" was just an open field?? After a couple of times, I noticed that there was a "road" between the fields where it was saying 'turn right', so again.. "what the heck, we've come this far"... :)
Got lucky and it was not too bad of a 'road', except for the 90* turn at one point and a huge rut running through the 'road'..
Finally got to the main hwy and determined that it saved about 5 miles, but going 10 mph through the fields, it cost us more in time...
When we got home, I went through the settings and found the new exclusion setting and also set it to calculate for shorter 'time' and not 'distance' and that way it tends to keep you on the hwy than the back roads...
I like the GPS, but also have paper maps and still watch out for signs and other clues as to the direction I'm going. I also have not been 'curious' about when it says to go a way I know is not exactly right... :)
Mitch