Lake maps apps.

[liketrolling]

this one cost $49 free for two week
https://play.google.com/store/search?q=n...apps&hl=en

http://www.navionics.com/en/mobile-apps

free on your PC
http://www.navionics.com/en/us-campaign
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Chart more detail in AutoChart Live with Vegetation and Bottom Hardness mapping; Follow contours

In addition to depth contour mapping found within AutoChart Live, you will now be able to map added layers for an enhanced fishing experience.

Bottom Hardness - Now the detail goes deeper. AutoChart Live uses sonar to measure and chart bottom hardness, tipping you off to likely hot spots.
Vegetation- The weed line can no longer hide. With help from your sonar beam, AutoChartLive can now instantly map weeds, brush and other vegetation.
humminbird just came out with this, have not tried it yet but you need a humminbird fish finder with auto chart live and it takes some time to make your own map
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