I have a Garmin ECHOMAP Plus 73sv. First time I took it out on a local reservoir, the depth lines showed perfectly for the body of water I was on. However, I went to another body of water and could not see any. I know data is available onthis lake as I looked at this lake on the demo unit in the store. Cannot seem to figure out why its suddenly stopped displaying depth lines. Thoughts?

I run two Garmin's and both do that, it just depends on what water I'm on.

One of our smaller lakes is a better map than one of our larger lakes.

I've been thinking about trying the card and make my own map.

We’re you running the navigation or fishing detail map?

Maybe you need to update your fishing/navigation maps.