City Navigator and City Select will both perform 'turn by turn' autorouting on the GPS.
Garmin say that CN is optmised for the StreetPilot series and (potentially) has higher quality intersection and road data (used for generating an autoroute).
Some users have tried CS on their StreetPilots and find that it generates very good routes.
CS is noticably cheaper than CN (both North America and Europe).
You can run either CN or CS on any Garmin autorouting GPS.
MetroGuide is only moving map and cannot autoroute on the GPS
Coverage is the same for all 3 North American mapping products and all 3 European products.
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