I don't know if any of you guys have ever used this, but I just got it, and I like it a lot. It is an online lake mapper, where you can save spots, structures, and more, as well as look at depth contours, etc. Plus, it was only 15 bucks for a year. Just thought I would share it with you guys. Link below...
~Ethan~
http://mapper.angling-technologies.com/map/