Hi there,
I had F3 for a couple of years and decided to upgrade to 5x.
I'm really impressed with the watch but I was literally blown away how well the navigation works.
Yesterday, I arrived in Providence, RI and used the watch to generate a 3 miles course. It came up with 3 options relatively quickly - while I was stretching - and I picked one through downtown. The prompts, the map, the directions around tall buildings, everything worked like a charm. I took my phone as a backup in case I'm lost but all went without a glitch. We'll done Garmin!