In the years that have passed since my first fishfinder, fishing technology has evolved a lot. I still recall seeing the icons of fish on the viewing screen. I remember being a kid and thinking that there was a large fish right under the boat. Although it didn't help me very much, the sonar and depth imagery technology have improved so much that a fish finder can be a great tool to improve your skills. Additionally, we now have great access to geolocation technology (GPS), which is available at very affordable prices. To create a comprehensive picture of your fishing grounds, combine underwater imagery data with location data to create combo units.