My DW has a Nuvi300(?) which works very well. It has voice guidance if you like that. However, it is NOT very useful dismounted from the auto.

I just spent 2 weeks touring the Scottish Highlands with a Garmin 60Cx with optional UK maps loaded. It works well in the car with auto-routing capability (but no voice guidance). It also works very well dismounted while geocaching and hill walking.
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"Sometimes, it's better to be lucky than skillfull"