GPS Issues - Garmin 545s

[Bo10LI]

The terrain disappeared from the navigation chart, and all references to the water and depth have too. The numbers section worked until last night when it started acting real funny and displaying over 100 feet of water in the bay where it's about 8 feet deep at that time. Garmin customer service isn't open until Monday, so hopefully someone can help me reset the unit or have advice.

Update: I pulled the G2 card and the standard detail has restored. I believe the card is bad or needs to be replaced. Hopefully Garmin will stand beside their product when I call them tomorrow.

Thanks,
Al