The Vexilar T-Box SP300 uses WiFi to connect its sonar returns to your smartphone. Now your iPhone or Android can be the head unit for your sonar. With a Navionics subscription, you can download maps before you head out and build depth maps as you paddle. Geotag fishing holes, save photos to a point on the map, cool stuff!

I’ve had this unit for several years and upgraded to a new unit. Comes with two older batteries which both still hold a charge. I have modified the shuttle to reduce size and weight.

Southwest TC pickup, or will ship at your expense.

Very interested... what did you upgrade too?

I got a Humminbird Helix 5 SI. The reason I changed is that I wanted one unit for ice and open water. The Humminbird has an optional ice transducer and flasher mode which are pretty nice.