I only really want a sat nav for when on organised runs, and the odd trip out
So was going to get a tom tom one v4, will I be able to connect this to a computer and use, one of the itn converter applications (tyre) ok with it or do i need a more advanced one.
The One V4 does not have the Itinerary Planning function which you require. You need one of the XL range. Once you have a suitable TomTom, the best PC software to use for this purpose is probably TYRE.