Are you interested in using Google Earth to view the sidescan sonar recordings from your lake-bottom? If so, here is a link to a page with some online samples of what can be done with sonar recordings from Humminbird (w/SideImaging) and Lowrance (w/StructureScan):

http://www.sonartrx.com/web/Home/SampleImages


Tore
SonarTRX