[QUOTE] Many, including me, don't in order to keep the satnav on while filling up with petrol, stopping to take photos etc. etc.. [/QUOTE] doesn't the Zumo have it's own battery? The requirement for an external power source is the main drawback of my 2610. The BMW power socket on my bike is always powered, unlike later CANBUS models, but it would be nice to be able to use the GPS whilst having a coffee or even on foot.