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Speed and ETA on Nuvi 850 faulty

Former Member
Former Member
Hi all, since I upgraded my unit to the latest firmware version the speed indicator has become erratic (speed suddenly increases by 10kph then drops back again, will not settle on a constant speed) and the ETA does not adjust i.e. once it has an ETA after calculating a route it does not change - even if I have gone past that time and have not reached my destination yet. Anyone experienced this and if so were you able to fix?