IMHO the problem to think about is to download the tracks & waypoints while on the trip, since all systems only offer limited memory capacity. Meaning you will need some kind of external storage.
The Garmin systems offer a world base map showing the major roads in most countries. They are even routable on newer models like the Zumo, but this doesn't make sense because of missing road details.
For motorcycling the latest model on the market is the ZUMO 660 with a nice large display and lighter than my old ZUMO 550.
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Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
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