The following is list of current and discontinued products Garmin's first in-car product series in their GPS products. The first Garmin Street Pilot was introduced at CES 1998.
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The devices used 8MB or 16MB cartridges, onto which mapping data was loaded from the user's computer, at a chosen detail level (8MB covered the Atlanta Metropolitan Area at high detail, or a greater area at highway-level detail).
The successor model was the Street Pilot III in 2002, which had a 3.85" 305x160 color screen and added voice prompts.
If your GPS is not shown you may want to contact Garmin and ask if your unit will load additional Map Source maps.
Also some units listed may have limited memmory so may not be able to load the entire mapset at one time.
If it matches the version currently installed on your Street Pilot c340, you don't need to download a new map.
You may need to install the Garmin Communicator Plug-in if you've never updated your map before.
In addition, an optional proximity-alert feature notifies you of upcoming custom POIs.