Navigation

As well as a well traced route on a map I'd like the support of GPS to navigate us quickly on the spot through tricky areas. We will avoid main roads but we need to get the min mileage done every day. I was counting on my mobile's TomTom to navigate us all the way down to Spain following the planed track we want. But after some bike-on-the-road testing, I'm having doubts about the usability of TomTom to follow specific pre-planed tracks. Might end up needing one of those Dakota 20 for the trip.