3rd party route mapper question

[kendoo]

What happens when I use a 3rd party route planner (harley route planner in this case) and then I download to a GPS with older maps? I have a Garmin Quest 2 that has 2007 maps in it. If I design a route that has roads in it that aren't in my GPS, what does it do?

 

[schlep1967]

I have never used that particular software but my guess would be that when you design a route you are basically putting in waypoints along your route. Your GPS will then calculate how to get between those waypoints on the roads it knows. Might get a little confusing if you put a waypoint on a road the gps doesn't know as I would assume it will take you on the closest known road to your waypoint.

Best bet is to download the route then actually look at what it is showing on the GPS through the whole trip while sitting at your computer. That way there are no suprises out on the road.

 

[jfheath]

From my experience, the satnav uses the waypoints to calculate the route, and will take you on any road that will get you as close as possible to the waypoint - usually measured at a rightangle to the road, if the waypoint is not actually on a road.

Since it is going off road, it takes no account of obstructions, as long as it is as close as possible 'as the crow flies'. If the crow chooses to fly across a railway line, it will do, possibly leaving you actually some distance away as you try to negotiate the obstruction.

Note also, that waypoints on motorways pose their own problems. If the motorway is new, the waypoint has resolve to the correct carriageway, otherwise you end up travelling up and down each side of the same road.