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Nuvi 250 Lag/Refresh/Delay

Former Member
Former Member
Hi all,
Please help!
I've a Nuvi 250 it's a couple of years old but is running latest software (v_5.00) and has nuMaps Lifetime 2011.10 Europe installed. I have had a problem with mapping and navigation prior to this.
When I use the unit in mapping or navigation mode, the unit is actually lagging behind my real position on the road. I am missing turnings. I was hoping a software upgrade and map update would resolve this.
Here are the things I've tried:

I've hit the reset button.

I've erased all my data by powering on and holding bottom right of screen.

I don't think I can view satallite info, I,ve tried holding signal indicator as some have suggested but this don't bring up any additional screens, so I can't tell if Nuvi is triangulating correctly.

Please help
Regards
Mark