Works pretty well for the price
Seems to work right up to the point where the battery gets low. Can use it for at least 2 long day trips on the lake before recharging.

This app uses a smart sonar system to detect fish location, size, and depth up to 40 meters underwater. It also provides real-time information on underwater topography, water depth, and temperature, displayed on your mobile device.
1.0.9
February 9, 2026
bug fix.
Joylog's smart sonar system can detect underwater fish and terrain information within a range of 40 meters.
Joylog provides real-time data on fish location, size, and depth, as well as underwater topographic maps, water depth, and temperature.
Joylog is available for iPhone, iPad, and iPod devices.
The latest version of Joylog is 1.0.9, and it was last updated on February 9, 2026. Specific update frequency details are not provided.
Joylog has an age rating of 4+, making it suitable for a wide range of users.
No, Joylog does not contain advertisements.
Joylog has a rating of 4.0 stars based on 5 user ratings.
Based on the provided data, Joylog is supported on iPhone, iPad, and iPod devices. Android compatibility is not specified.