FISH FINDER BASICS
FREQUENCY DEMYSTIFIED
Sonar is just sound, but it’s still pretty amazing technology.
If you want to know more about it, and get the details that will help you maximize the performance of your fishfinder, check out this article:
WHAT IS CHIRP SONAR? ESSENTIAL FISHFINDER TECH EXPLAINED
What We Consider When Selecting a Fish Finder
Obviously, we prefer CHIRP sonar systems. But what else matters?
Target Separation
Target separation is simply a measure of how precise the fish finder’s sonar is at distinguishing individual fish from one another. Smaller numbers mean better performance.
Transducer Beam Angle
Often a selling point, this is not nearly as important as marketing leads you to believe.
All other things being equal:
Wider angles let you see a greater area below your transducer.
But, and this is a big but, the “specified cone” isn’t the actual area the fish finder reads. Instead, it’s shaped more like this:

Moreover, for a specified beam width, the structure of the bottom can greatly affect performance. And the greater that width, the more likely this problem is.

As a general rule, the shallower the water you fish, the wider the transducer beam angle you want. Too much will create problems, and if you fish in deeper water, you want a tighter, more focused beam angle.
Side Imaging Sonar
This is exactly what it sounds like. Some advanced fish finders offer specialized transducers that transmit and receive off the starboard and port sides of your boat. The result is a 2-D image of the water column to either side.
Some brands sport a range of as much as 800 feet in either direction!
Obviously, this can be incredibly useful for locating fish, and it’s an increasingly popular option. Be aware, however, that the depth of these side-facing transducers is limited. Side imaging sonar won’t be penetrating the water column very far, though it’s an awesome compliment to a traditional transducer.
Maximum Depth
You want a fish finder with good maximum depth, and you want to match this rating to your actual use. Especially if you fish deeper water, like the Great Lakes, or if you’re a saltwater angler, this is something to consider carefully.
Display Size and Resolution
Larger displays are easier to read and use, but of course, they cost more, too.
And bigger isn’t always better.
Resolution is a measure of how much detail a fish finder’s screen can provide, and a small screen with great resolution can be easier to read than a large screen with only average resolution.
GPS and Maps
We think these are now nearly essential considerations in a good fish finder.
From careful waypointing to honey-hole marking, GPS and maps add so much functionality that they’re almost a no-brainer.
Our Pick: The Garmin Striker Vivid 7cv!
Fishing electronics can be painfully expensive, but don’t buy into the idea that they're unaffordable.
As our shortlist and reviews demonstrate, there are great options below $500.
Our pick for the best fish finder under 500 is the amazing Garmin Striker Vivid 7cv.
It offers a larger screen than its competitors without giving up any ground in terms of image quality or brightness. In fact, it’s probably the best of the bunch on these fronts. It features an intuitive, easy-to-learn user interface that doesn’t require a degree in computer engineering to use. Its transducer is capable of both CHIRP sonar and down imaging, offering excellent tech for the money. And its GPS and mapping software are simply excellent, especially since you can pair this unit with your smartphone to download user generated maps of new waters.
Simply put, the Garmin Striker 7cv outpaces its competition.











