Thinking about a new GPS (although I have yet to seek budget approval

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The Zumo 220 looks to be a reasonable buy � a lot cheaper than the 660.
The only disadvantage is slightly smaller screen, lack of MP3 player and headphone socket (as far as I can see).
I downloaded and read the user manual and it seems to do everything.
Hard to tell if the bike mount is "secure" from the pictures on the web (I once lost a Quest on the M4

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And why is the old Zumo 550 still so expensive ?