Does anyone know of a good aftermarket sat nav to replace the bolero with.

Smartphone? CoPilot with live traffic.

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Smartphone.....far cheaper than replacing the unit....or Second hand Columbus if you want to spend money...

Have to agree with stever750, smartphone with Co pilot.

Get a powered brodit holder too and jobs a gud un.

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Pioneer AVIC-F9310Bt - stunning unit. Straight in and looks OEM

Awesome spec and looks.........

get a used columbus

Blaupunkt has one too, that looks OEM and integrates with the climatronic and park assist etc. 

I cannot fault the Waze app on iphone or android phones. Very clever app with handy re-routing. And free! Just stick your phone in a holder and jobs a goodun.