I've an O2 XDA II & and a IIi on trial. I want to install a sat-nav package on them and hard wire it to the existing GPS unit in my vehicle.

I'd like to try a flavour of Tom Tom but it appears only v3 is compatible with the XDAII ?

Any suggestions where I can find a single source solution please ? or any alternative products I should consider ?

I possible I'd like to keep the existing GPS as it covers other duties as well.

Thanks