When selecting a portable sonar device for fishing, there are several key factors to consider. Firstly, think about the type of fishing you will be doing and the depth of the waters you usually fish in. Make sure the sonar device you choose has the appropriate depth range for your needs. Secondly, consider the display size and resolution - a larger, high-resolution screen will make it easier to read the sonar data. Additionally, look for features like GPS integration, mapping capabilities, and connectivity options. Battery life is also crucial for portable devices, so opt for a model with long battery runtime. Finally, read reviews and get recommendations from fellow anglers to ensure you are choosing a reliable and user-friendly device.

This answer doesn't make sense or isn't related to the question. Mark it as a probable hallucination of the AI model.

Topics covered in this question:

Fishing Gear Battery Life Gps Integration Portable Sonar Device Depth Range