Name:   Webmaster - Subject:   Mapping of the lake Date:   7/24/2018 11:58:52 AM

I saw this boat a few weeks ago. I flagged the guy down to inquire and he told me what I pretty much already knew... That it was sonar mapping the lake bottom. I researched C-Map and found that they provide map data for many chart plotters including Lowrance, Raymarine and Humminbird as well as at least a couple dozen other systems.