One word "fishidy"
Also it
free app unless you want the hot spot which I have never cared for, most of the navionics maps are also on fishdy. You set up an account, find you favorite lakes, and follow them. People who also follow your lake can save waypoints to either share with all, those on your friends list or keep hidden.A lot of different ponds for ice fishing have no lake contour maps "lake irvine", but there are fishermen who have found spots that have found fish. I don't have navionics app so I can't say for certain either way
but I can cut and paste coordinates of my google earth places of interest that I have saved for Lake Alice,. If I lose my phone no worries there saved online. Good way to meet people who like to share areas of fish but don't want the whole world to know. Just my experience
http://www.fishidy.com/