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.
--
Best regards,
Andrzej
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