Sonar Interpretation – Sonar and Down Imaging

I get asked sometimes if Down Image is really worth the extra expense over the regular Sonar  units. I definitely have to say yes but only if you do not know what your looking at with the Sonar unit. I’ve used sonar units since the old flashers and paper graphs from back in the mid to late seventies. One thing for sure is that you want to get one with a GPS so you can return to the structure that you will find with them.

My units are Humminbird Onix 10 SI Touch and Helix 10 DI and a Helix 12 SI. All of these unit have GPS and Sonar built into them. I’ve also used a Garmin unit and Lowrance units with good results.

One thing I must say is that of all the Humminbird units that I have owned, everyone of them has had software issues and several have had to be returned to Humminbird for repairs! I don’t know why they can not get their software right before they release their products. Anytime that they have to release five to ten software updates that tells me they have issue with their software!

All of the images you will see in this article will be from recordings that I have recorded with either my Humminbird Onix or my Helix 12 units and then viewed in ReefMaster Viewer software.

I use the Sonar with the 83/200 kHz transducer settings and my chart speed is normally around 5 or 6 with my boat speed at about 3.5 to 4 mph when I’m doing the recordings.

Look at the images below and you will be able after a lot of time on the water looking at different structures to learn what you are really looking at. In my next blog I’ll show you the Side Images and the Down Images views.

Hope this helps you to learn your units a little better and catch a few more fish.

Click on the image thumbnails for a larger view of the images.