Most men are too smart to read the manual on anything, we already know it all. LOL With the millions of bits of information added together to make a route the program may be correct the data base info may have a problem. I didn't make myself clear on my example, I was on a side road and wanted to head east on an on ramp to an I route. The GPS said take ramp west, go to the next interchange west, then do a 180, ramp right, turn left, turn left on ramp east bound, but I had reviewed route and over road the GPS and it recalculated the route correctly. These GPS are good but they do have wrong Lat. and Long. for address's and wrong road names and on. Just checking the routes and having some position awareness can help immensely.
2004 Clss C 31' Winnebgo