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Kallie,
As mentioned, my eTrex and a previous GPSMap unit have the function that will allow me to choose each time I route. My Nuvi, however, does not allow me the option to choose before each route.
By default, I will use fastest route. When I don’t have a fixed plan where to travel and I have time, I will choose shortest route as it sometimes takes one on “interesting” roads. But then I am also prepared to turn around when necessary.
I use offroad/straight line routing mostly when hiking and there is not necessarily a routable route to calculate on. I then just need to know the general direction where my destination is. I suppose one can do the same when driving also.
I do most/all of my route planning on Basecamp and then transfer the routes to my GPS. What have found is that there are differences in the routing algorithms between Basecamp and the GPS. Even between different GPS units. I have planned the exact same route on the same map set on 2 2 different GPS units set to say fastest route and they will come up with different routes. I know that other people will just load waypoints to the GPS and then have the route calculated by the GPS.
What I then do is, as soon as my planning is done on Basecamp, I will just randomly add via points along my planned route. In this way I will “force” my GPS to navigate the planned route. In this instance it then, mostly, does not matter if my routing method is fastest or shortest.
I hope this helps.
Danie Kotzé
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