Streetpilot 550c
My Garmin 550c has the Bizer Map in it, and the buoys are marked bw or rw for black or red. I set my dock as a favorite (Parker Marine), and while north of Rattlesnake heading roughly toward towards the Weirs, I hit favorite, selected dock, and said go. It said (and actually said, because it does have text to speech) "Drive to highlighted route, and then turn left." . The highlighted route, of course, was route 11. I do not think any of the Nuvi auto units will do routes and waypoints, but the crossover model(s) probably will. Just my experience, and humble opinion.
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