Hello Sir/Madam, I apologize for the long delay.
I don't think this is a data card problem, however if you still want to try with a new data card I recommend to buy it from eBay for "cheap". Click here to see some of them ===> http://goo.gl/Fc6RHs
I would try first with an update. Here is the updates page for your device: https://www8.garmin.com/support/collection.jsp?product=010-00259-00
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Thank You and I wish you all the best. GOD Blessings!!!