I experienced the same issue with a my new Montana 600... I first realized it when I miss a turn and magically I gained 5 mins. Now I guess I know why! On Tue, Aug 19, 2014 at 6:56 PM, Bernhard Hiller <bhil@gmx.de> wrote:
Cze´sć Andrzej,
thanks for this (bad) information. Looks like the Oregon 600 (an outdoor device) uses the newer algorithm. Well, it means, I can now stop optimizing for the "correct" route, and perhaps rather try to "optimize" the calculated time for the selected route (i.e. get it closer to my driving times)...
Am 16.08.2014 14:46, schrieb Andrzej Popowski:
Hi Bernhard,
Garmin has 2 version of routing algorithm, older and newer. Older is used by Mapsource, older nuvi, probably by outdoor devices. Newer algorithm is used by BaseCamp and last 2-3 generations of nuvi.
Newer algorithm is designed for speed of calculation rather than quality of results. Finding fastest way is based on road classes. At longer distances device uses only class 4 roads ignoring shortcuts with lower class. That's why you can optimize route manually.
Older algorithm is more precise, it can use lower class roads, when class 4 roads are missing. Calculations are longer. But probably you still can find better route manually.
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