Most XRRs in the UK are likely to be European models (XR650R-ED) which have two generator outputs, one is 12V AC one is 12V DC. Both are regulated. Plenty of north american (AC only)models have been imported too. The sticker under the seat will say if it's a -ED model. The DC feed has a regulator-rectifier and smoothing capacitor mounted near the headlamp. The AC feed has a regulator mounted under the seat. If you've got a standard indicator switch amongst your handlebar controls, then chances are you've got DC too.
If using a fag-lighter socket, vibrations can break the connection, particularly at less than a leisurely pace off-road, causing the GPS to power off. If internal batteries are fitted as a backup, then it should be fine.
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