The purpose of a fish finder is rather obvious if you think about it. It is meant to find fish, but if you look into the intricacies of how such devices tend you work then you would discover that there is a lot more to it than that. The simplistic interpretation of fish finders that many people rely on is not reflective of the ultimate truth of how they tend to help you out whenever you are trying to catch some kind of fish.
The sonar setting which gives you an idea of where a cluster of fish could be found is only one small part of what this device can do for you. According to Fish Finders Judge.com, a renowned expert in these sorts of things, you should also use your fish finder to ascertain water temperatures. Fish tend to behave differently based on the temperature of the water they are in, and many of them would end up hibernating if the water is too cold. You need to track the water temperature and go to a spot where the water is a little bit warmer than it is in other places.
Warmer waters would have a lot of fish that are being fairly active. They would be swimming around looking for food or mates that they can make babies with, and this is where you can come in to try and catch them. Sleepy fish are not going to bite your lures or baits, so trying to find more active fish is an important part of ensuring that you can get a big catch at the end of the day and you can use your fish finder to help with this sort of thing.