The Dakota 10 isn't bad as well. Slightly larger and touchscreen and a bit cheaper. http://www.handtec.co.uk/satnav-gps/outdoor-gps/garmin-dakota-10.html
You can get the Dakota 20 for slightly more which has Ant+ for cadence, heartrate, etc.
Alternatively, a holder for your phone and Tom Tom app or something plus a rechargeable battery pack can do the job
@aggi started
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The Dakota 10 isn't bad as well. Slightly larger and touchscreen and a bit cheaper. http://www.handtec.co.uk/satnav-gps/outdoor-gps/garmin-dakota-10.html
You can get the Dakota 20 for slightly more which has Ant+ for cadence, heartrate, etc.
Alternatively, a holder for your phone and Tom Tom app or something plus a rechargeable battery pack can do the job