How StrikeLines Charts Are Made

Side-scan sonar is the primary tool we use to make detailed maps of fish-holding bottom structure.

Traditional sonar can only take measurements directly beneath the boat, but side-scan sonar can scan a 300-foot-wide swath of the seafloor as you drive overhead. When displayed on a computer screen, side-scan gives you a high-quality, top-down picture of the sea floor.

Couple that detailed picture with GPS data, and  you can make some incredible maps of fishable structure.

After much experimentation, we decided that the best way to visualize bottom structure was to digitally trace structure that we see in the side-scan data, and then overlay those clean, traced lines on the existing GPS base map. That way you get all the benefits of your familiar GPS map, with this whole new level of detail added on top.

Lots of other maps already do a very good job of showing you where the channels, contours, buoys and marinas are located. We've taken a different approach with StrikeLines. Our charts do one thing: Show you where the fish are.

StrikeLines does the hard part for you. We spend hours on the water, we find fish, and we put that information right where you need it. . 

All you have to do is load a custom StrikeLines chart and fish the lines.

Side-scan sonar surveys a wide swath of the bottom as the boat passes overhead.