Your owner's manual is available here: http://www8.garmin.com/manuals/StreetPilotc340_OwnersManual.pdf
Or you can go to www.garmin.com. Click on Products/On the Road/Automotive. Then go to Discontinued, click the C340 and Manuals.
Oh my God, Jim is stuck in South dakota.
Jim,
I have heard that if you upgrade to the latest unit software, it will solve the freeze up problem. I went to Garmin.com and copied the URL for you to go to if you can. Follow the directions and put the latest version of software on your 340.
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