I have a zumo 400, not that you can get them any more, the 400 is permanently out of stock. It is basic, ie no bluetooth but it was cheap and it has detailed UK maps with reduced detail EU maps . The zumo 400 has the standard clamp / ram-mount, which I have fixed to the cross bar so that it sits below the instruments. It is powered directly from the battery, through the fused connector.

If you are looking for a gps for the bike, you should consider:

It is strictly a bike gps, or do you need it to be removable for use off the bike, either on another vehicle or as a handheld unit? Consider size, as you will need to remove it from the bike when it is parked up.

Price I - robust waterproof gps units are generally more expensive than their car-based alternatives, do you need all of the "expensive bolt ons" such as bluetooth music etc that the higher spec unit offers.

Price II - additional maps. If the coverage is insufficient for your needs, factor in the cost and availability of the additional maps.

Price III - map update costs. The map you get with the gps will become obsolete, consider how much the updates will be,or if there are any free updates.

Software accessories - POI (points of interest) files are generally free if dated, however some like speed cameras are often charged for, but may be initially free with the gps unit.

What do you want to do with the gps unit, is it strictly a "get you places" thing, or do you plan to use the route data elsewhere? In which case you might wish to explore how easy it is to get at the route data held on the machine. For example the route data from the zumo can be dragged into Google Earth to build up a collection of route data.

Si