Does the760 adapt to ETA discussion.

http://www.poi-factory.com/node/3570

http://www.poi-factory.com/node/17131

One of those threads was old so I don't think you guys are getting my question.

What was leaked on a GPS site was a user that when he used two 760 on the same route, the one that he actually drove previously had a different ETA(with all settings the same). The article went on to suggest this updated OS is Garmin's alternative to Tomtom's HD routes(or whatever they are called).

Personally I used to get a 37min ETA on a known route, and now the same exact route is 31min.

I still may be not understanding you. Are you saying this link from my earlier post's message node doesn't help?

http://www.gpsreview.net/train-your-nuvi-eta/#more-1850

I read that garmin has about 8 types of roadways, and it evaluates your performance on each of these. Then alters its assumed driving speed for ETA calculations. What I read and the above link seem to be backing this up. I have never studied it close enough on my unit to confirm.

Yes CraigW you are talking about the same feature. What I am looking for is how they are doing it.

From the looks of it they are using your actual speed(averaged)to alter their road speed table. For example interstate changes from the default 55(or whatever)to your averaged speed while on interstate roads. If so does it do the same for the others, and what are they? State highway, residential street etc.

Thanks

More likely is that for different road types, they are keeping track of how much faster/slower than the speed limit you tend to drive.

That way, they don't need to keep track of a bunch of different street types AND a bunch of different speed limits.

I suspect that some of the road types might be Urban Interstate, Rural Interstate, State Hwy, Arterial, Secondary, Residential, Ferry, ???

Here's how I've seen the ETA thing explained eslewhere...

In the firmware there's a formula - the variables in that formula include the speed limits for various classes of roads (like the road types noted above), and an average speed one can expect to achieve given the various road classes on a route. The only thing "they are keeping track of" is any deviation from the expected average speeds for an active route - and the eta is computed taking into account the expected average speed, and how much your driving habits deviate from that expected average and nothing is 'saved' for later use.