Originally Posted by
kickingback
If you have Google Earth, you can take a look at the map of the lake and see if there are any old river channels or creeks that run through the lake. Google maps usually shows the old channels by a line on the map. Check your settings to make sure you are viewing all the rivers.
Also Google maps may have older pictures of the lake you can look at. Go to the top and click on the clock icon and then adjust the slider bar to the date of the different pictures. You can then maybe see some structure or low areas where fish MAY hang out. Your map card on your sonar should have all the latest updates for the depths of the lake so study that completely and check out areas where you may have missed near drop offs, or beds of rock or shells. Fish will hang around hard ground sometimes as well. See if the bottom looks lighter than on your sonar. If lighter than the surrounding area then the bottom is hard. You can usually find crappie hanging above old roads or hard structure.
Once you find something, take your phone with you and use the GPS in your phone and Google Earth to track and get you to the points you found on the map.
Good luck!