[OSM-newbies] Routing question

[Donald Campbell II]

Routing :  I downloaded the premade Oregon map from cloudmade in img format
for my Garmin Legend HCx.  Looks great, I tried navigating from my home to a
point of interest and it made a straight line as the crow flies.

Is Portland missing some data it needs to work right?
Does cloudmade not correctly make the maps routable?
Is it a Garmin thing?

Thanks,
-DC
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