Our Garmin makes me wonder sometimes like when in Las Vegas it said "turn left, then make a U-turn" which could have been done with just an easy 90 degree right angle turn. Imagine trying to make a U-turn on a busy 6-lane road towing a trailer... :E
Worst errors are when my lovely DW & copilot/first officer inputs incorrect info. like "ABC road east" instead of "ABC road west". Pfffft. Good thing I'm a good backer-upper. 'Nuf said. :M
DW loves her google maps. Me, the one that always does the driving, hates google maps with a passion. Give me a good old-fashioned paper map any day of the week and I'll get you there safe and sound thank you very much.