My apologies you are correct. I thought I remembered reading somewhere that if you lost signal while using your navigation it would still work as long as you had GPS signal. Maybe that was because it already had the maps downloaded or maybe I'm going crazy. Anyways I turned off my data and you are correct it wouldn't get the directions.
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CoPilot Live has maps stored on the phone so it can be used without a data connection. for 4.99 you will have a nice vehicle GPS when the D1 reaches it's EOL for you.
I'm getting ready to buy it for the same reason.
Navionics also has nice maps for water navigation. Unfortunately, nothing available for Northern Nevada where I do 95% of my fishing. But if I lived in Florida I would have that regional map on my droid too.
Nate