What You Probably Didn’t Know About Down Imaging Sonar

Fishing is among the best experiences on the planet. Whether you engage yourself in this activity for fun of sport, or even as a job opportunity, you realize that you need a way to locate where the fish specifically are. Every fisherman, therefore, has to find a way through which to locate where there are either schools of fish, reefs, weed or even bridge pylons under the bought because if you go out fishing and you don’t have a way to locate where fish is in plenty, then it is very likely that you end up catching a limited number of fish and waste too much of your time. A quality fishfinder starts at roughly $500, but it will surely pay for itself since you reduce wasting much of your time fishing and you increase the number of the fish you get altogether.

The use of fishfinders is one of the most developed practices in fishing. A fishfinder is basically an instrument, usually termed as a sounder, that detects reflected pulses (sound energy known as SONAR) in the water and helps locate fish. In the case of the most modern fishfinders, which also have the zoom functionality, the reflected sound waves can be used to determine measurement of the object and therefore aids the fisherman in interpreting the information on the graphical display, more accurately.

There are a variety of fishfinders in the market, but the most common include both down and side imaging. Better and better ways of locating fish are being invented each day, but let us focus a little bit more on down image sonar.
So what is down imaging sonar? This is a fish-locating practice that entails the use of high-frequency sonar beams that are emitted in ultra-thin slices and meant to produce comprehensive and detailed images of what is under the boat. Note that down imaging users, just like the side imaging user, have to choose between 455 or 800khz in the settings menu so that they can get the most favorable resolution for them. The high-resolution pictures that are produced by down imaging sonar are what help anglers locate any object that the boat passes directly over. This is made possible by the use of high-frequency waves that are reflected by the object beneath the boat.

Some of the Advantages of Using Down-Imaging

1. Speed. Questioning the speed of the down imaging is very important since if the speed were very slow, let’s say half the speed of the boat, then it is very possible that very few fish or no fish will be caught at all since the images that will be displayed on the graphical screen will be something of the past. Down imaging, usually abbreviated as DI, spots impressive speeds of around 45mph. This is very necessary to the operator since it spots fish that the boat is passing directly over. One good example of a fishfinder is 2D, which is very impressive on speed, probably the reason why it is a favorite amongst most people but, DI is also very fast and unlike the traditional 2D, its images are top notch making it very reliable.

2. Unlike side imaging which gives a “fly-over” kind of images, down imaging sonar gives high quality images that seem like they had been taken from the sea bed.

Unlike side imaging that provides a 180 degrees coverage, down imaging is purely dependent on the selection its user makes. For instance, the humminbird users have three settings to choose from: “Narrow”, which covers approximately a third of the depth, “Medium”, on the other hand, covers an area that is equal to the depth while “Wide” covers 1.5 of the depth.

All the above three settings are dependent on what the user needs to do at that moment. If, for instance, he/she wants to pinpoint a specific area for cover, then “Narrow” is the most recommended. On the other hand, if the operator needs to search a larger area, then either the “Medium” and the “Wide” are simply the best.  There are weaknesses with the use of DI. The fact that fish may be shown as dashes or dots may make it very hard for the fisherman to carry out efficient fishing. It is therefore advisable then, to use two or more technologies hand in hand. The reason is because these technologies do not offer the same things. In most case, one reveals what the other is unable to show. Using them together means that you gather more information at once.