Fishing Chart not Displaying Depth Lines? (Garmin ECHOMAP Plus 73sv)

[IndyQ]

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?

[WCWV]

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.

[Junger]

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

[tander]

Maybe you need to update your fishing/navigation maps.