I've been using Garmin Vista HCx for 3 years now and like it a lot. You do need to get maps for it - I'm using Garmin City Navigator and it's been working fine for touring the UK. The screen is smallish but I find it good enough (I'm pushing 50 and cannot read without my glasses - still, in daylight I can usually read the screen directions without any issues). With City Navigator maps you get turn-by-turn directions that work quite well provided you learn and account for the limitations of the device. Specifically, if you want it to get you to a point - that point should not be too far from where you are. In my experience, in England that should be closer than about 50-70 miles. Otherwise the task becomes too complicated and you may get some stupid and misleading directions. But if you know the points on your route that are within reasonable distances from one another it works just fine. One thing I like about Vista (as opposed to some newer bike-specific models) is that it runs on AA batteries that you can get anywhere - big plus on a tour when you may not have the means to charge the rechargeables. Hope this helps, feel free to ask more specific questions.