Hands down Navionics. Don't know what sonar unit you have and they have several different levels of detail on them and at least get the one that has the HD and 1' contour lines. That means every 1' of change it will show as a line. Much easier to see things to check out with that. You can see that stuff running down the lake and a hump or hole will show up like a bulls eye type target. I have the Platinum one, but if the Gold has the 1' elevations on them they are very good too.
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