The S version fits most fish finder brands, including:
Garmin Striker Plus 4 inch
Garmin Echomap 4 inch
The Rotating Platform can be used as a flat surface to make many items StarPort compatible, meaning these items can all be plugged in and locked in place on your inflatable, kayak, sailboat or any other place that will take a StarPort. Once you have finished using the platform it can be removed and the StarPort can be retasked for another application.