Review on Portable WiFi Fish Finder with GPS for Kayaks, Boats, and Ice Fishing - Deeper PRO+ Smart Sonar for Deeper Insights by Jaewon Hahm ᠌

I've been on the water twice since I bought it. Used mainly at low speeds, tk. I use it without a holder, I just tie it on a rope from one side, it jumps on the water at high speed :) Ideal for trolling. The chart plotter mode works fine. The most important thing is that there is synchronization through the cloud. On the second fishing trip, I took another smartphone and synchronized it with the depth measurements from the previous fishing trip. Accordingly, less time was spent on reaching the desired points.