Garmin Navigation System Homepage With Sat Nav Information

Reliable garmin navigation system Information and Sat Nav Systems for Sale

£75.48 £78.73

Why would the gps garmin navigation system say my average speed is 92mph when it should be lower?
Any ideas? If it helps, we have been traveling through mountains and across ferries. The only things I could think of would slow the average speed and not increase it. Could it be that we adjusted the clock back 3 hours?

Of the Garmin navigation systems which is the better Garmin c550 or the Garmin 340?
Also what is Bluetooth technology?

Please HELP...what garmin Navigation system should I buy?
I want something reasonable but good.

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