iBobber castable Bluetooth smart fish finder
This is a high-tech fish finder that works in conjunction with your iPhone. Using this unit you will be able to scan up to 135 feet. In addition to this, you will also have access to the lunar calendar that allows you to check the weather, the wind, and temperature. You can also use the device to set up GPS hotspots where you can easily find fish.
According to the manufacturers, it comes with a rechargeable 8-hour battery and is highly portable thus you can easily move around with it.