Garmin STRIKER Cast Castable Sonar Device, Without GPS, Turn Smartphone or Tablet into Fishfinder

I was surprised at how easy this was to pair with my Android phone I would recommend using an old phone or getting a cheap phone or even a tablet that you wouldn't mind dropping in the water!. Download the app. Once you have the app you don't need data if you're out in the field. It worked great ice fishing 40 ft. Looking forward to taking it out and trying it in deeper water. The only downside I could see to this unit over the Garmin Striker kit is having your phone out and trying to fish at the same time. Once you figure out a hands-free device, you're all set! One big upside to having this system is that it fits in your pocket and ready to go to your next fishing spot, instantly.