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How do the various route calculation options interact?

So a profile has various Navigation/Routing options:

Popularity Routing

Routing Mode

Calculation method (minimize distance, time or ascent)

Lock on Road

Avoidance Setup (major hiways, toll roads, unpaved  roads, ferried,narrow trails)

First question, is how ddoes the popularity Routing interact with the calculation method? Let’s say we have minimize distance set. Does that completely override the use of the Garmin heat map in choosing the route?

Second, for not calculation method; how smart is the algorithm? If I select minimize ascent, will it prefer riding 40 miles with 1000 feet of climbing over a 10 mile route with 1010 feet of climbing? Or will it be smart and choose the 10 mile route even though more climbing? And I’m assuming it ignores the issue of gradient on the routes.

When using Back to start with most direct route; does it still use all the routing settings for the profile?

 I’m interested in this as recently I was on a ride and asked the Garmin for direct route home and it kept wanting me to take a much longer route than the correct one. And looked like it wanted me to get on a ferry, at least that was the only logical explanation of what it was showing as no other way to cross the water…. Even if that was ok, the route was at  least twice as long as the path back the way I came across the bike path on the Richmond bridge. Not until I was actually on the bridge did routing show the correct return path over the bridge.

Pretty sure I’ve seen this before when in Marin but didn’t have a screenshot. Next time I’ll triple verify my routing settings, but see no reason for the 1040 to choose a much longer route using a ferry unless was very obsessed with minimizing ascent ( which was the chosen calculation method). Note the blue line showing the route I had already ridden vs the 1040 generated return route. And the route had 2847’ of climbing which was far more than the route over the Richmond bridge…

Edge screenshot of odd route