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[mkgmap-dev] road_speed parameter

From Norbert Hoffmann nhoffmann at spamfence.net on Wed May 27 15:16:13 BST 2009

On Wed, 27 May 2009 14:43:01 +0200, you wrote:

>I assume that the road_speed values in style file represent these 5 Garmin road classes. 
>But how does the GPS device know what speed is referred to by what road class? Is there 
>a speed table in gmapsupp.img file?

I have a nüvi360. There, it seems, is a startvalue for the speeds for the
roadclasses. While using the device those values are adjusted by time to
the actual medium speed per class.

So the "arrival time" after a software upgrade starts as a vague estimate -
but gets better from day to day.


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