StructureScan® Explained by Luke Ryan

Luke Ryan talks about how you can distinguish a good fish from bait by using StructureScan.

A relatively new tool that has made its way to the market is something called StructureScan. Some units have it built in, others will need to buy an adaptor box to make the unit capable of displaying the reading. A new longer style transducer is also required, which operates at really high frequencies of 455kHz and 800kHz.

StructureScan was primarily designed for shallow water work up creeks and rivers. It works by shooting a beam outwards to the left and right of the boat, giving you a side on view. This allows you to look into the structure and determine whether there are fish present or not. StructureScan can also be used in a DownScan view, similar to how a normal sounder works. Now, being such a high frequency, the readings are displayed with great amounts of detail. The images that StructureScan can display are with so much detail, it is almost like looking at a picture.

The DownScan can work effectively out to 60 metres of water, and I think that in certain situations StructureScan will work better than others, proving it can be a very useful tool. I think when using StructureScan in deeper water, the conditions need to be good. From my experience, using the tool in rough water didn’t seem to give us as good of a reading.

One situation where StructureScan can be a very useful tool is when you come across new ground that is showing good readings of fish schooled close to the bottom. You may be unable to distinguish whether they are good fish showing, or if it is just bait. What the StructureScan will do is separate the image and give you a much more detailed picture of what it really there. You can have your sounder working on a split screen with the structure on the other. The sounder may display blobs and balls close to the bottom, however on the structure it will show you the difference between a good fish and bait. It gives you such a fine image that you can actually see individual fish that are separated from each, unlike a blob figure displayed on the sounder image.

There are some important things to remember when using the StructureScan. One is that the beam that the StructureScan transducer shoots out is a lot smaller and narrower than the beam that the regular transducer produces. A fish that is picked up on the outer ring of the regular beam may not be displayed on the DownScan image. Obviously, the deeper you go, the less area the beam will cover. Also, due to the high frequency, you will experience interference if you have it highly tuned. Travelling at low speed is a must.

My preference in electronics is with the Simrad brand, not because I am associated with them but because out of all the brands I have used over the years I find that Simrad has hands down outperformed every other unit I have ever used. I fish a lot more than the regular angler and I demand the best gear available, that’s why I choose Simard.

Luke Ryan


About Navico


Previous Looking for Clues in the Blue
Next Bream Style Trout!

You might also like

Fishing Pro Tips

Guestys Tackle Tips : Stick Shadds

Michael Guest goes through the different methods to get the best out of stick bait style lures.


About Michael Guest

Michael Guest’s love of all things aquatic was instilled at a young age, fishing, spear-fishing and windsurfing. His passion has grown into an addiction and whether it is catching bait off the wharf, teasing Marlin on the continental shelf, or crashing through undergrowth and casting at bass this is where he is most at home. A fisherman with the environment at heart, Michael loves to spend time fishing with his family. Catch and release and take only what you need are the two philosophies Michael wants to instil in all young anglers. From the watery depths to dusty roads Michael cut his teeth in the most spectacular of motorsports – rallying. Wins at State, National, Asia/Pacific and International level elevated him to be the first Australian to tackle a regular ride in the World Rally Championship.

Fishing Pro Tips

Lee Rayner Gives Gomoku Tips with A Flathead

Lee Rayner of Fishing Edge gives some tips on Gomoku Tip with a Flathead

Fishing Pro Tips

3Ts Flathead: Tips To Catch This Sensational Species

1. A great set up for casting lures at flathead consists of a 2-5kg graphite rod and a 2500 size reel with a smooth drag. We even up that to

Troy Eaton & Scott Wakefield

About Troy Eaton & Scott Wakefield

We have been keen fisherman since our early childhood and have spent fishing experiences together in learning and experiencing all facets of fishing in the Victorian region. In our early years we weren't afraid to ask questions and were really keen to achieve the best results we could with our fishing.


No Comments Yet!

You can be first to comment this post!

Leave a Reply

Prove you are human * Time limit is exhausted. Please reload CAPTCHA.