How does a GPS calculate which route to display? Shortest? Fastest? Most ridiculous?
October 16, 2010 10:55 PM Subscribe
How does my GPS decide which route to take? Fastest? Shortest? What?
posted by misanthropicsarah to Travel & Transportation (8 answers total) 1 user marked this as a favorite
Before our recent trip back to MI, we bought a Garmin Nuvi 260W because we were going to be driving across the state and up the west coast, in areas we weren't totally familiar with, but in some we were. In the areas we were familiar with, we left the GPS on for shits and giggles, as one does, and the Garmin was directing us down dirt roads and snowmobile tracks, and routes that were neither the fastest, shortest, or only way to get to our destination.
So, how on earth does the GPS decide which route to spit out? In some cases we would turn on to a major road (seriously, a 4 lane road that's been there for decades) that wasn't even "listed" on the GPS screen until we turned onto it and it recalculated. Clearly, the road is in the database or whatever, as it found it when it recalculated, and it was a road it had taken us down the day before for something else!
So, does it calculate the fastest, shortest, something elsest? I've read the online manual, and there does not seem to be a way to choose one of those options, as there was in the old days of MapQuest directions. Am I missing something completely?
When it's telling us to take a seasonal snowmobile trail instead of US-31, I really take issue. I mean, we get there, but seriously....