First time playing with building sidescan mosaics in Reefmaster tonight and noticed an oddity. I was scratching my head as to why I didn't seem to see the center line of my sidescan track and when I used the sonar viewer window and activated the boat icon... sure enough it shows imagery for one side of the boat and not the other. Running a Humminbird Helix 9 G3N.

Why is this? Do I not have something set properly in Reefmaster? I have checked the swath control and both left and right sides are at maximum. Is there something incorrectly set in my Helix unit? Super frustrating. I'm hoping it's something simple that I've overlooked...

Is this for all sonar logs that you have recorded?
HB logs each channel to its own file. Can you look into the sub-folder with the same name as the sonar log (e.g. Rec00001) and see what files are in there and what sizes they are? There should be files with names of the form B00X.SON/IDX.

Here's what I'm seeing in my file folder.

Hi, sorry for late reply - any chance you could zip up the .DAT file and the entire subfolder and share to This email address is being protected from spambots. You need JavaScript enabled to view it. using a file-shareing service. I will take a look.

Yep! I sent the files over to support@ via WeTransfer. Download link will expire in a few days. Thanks, Matt!

Interestingly, I went out again, recorded in another location, and all side-scan imagery appeared normal (could see both sides and make adjustments to the range on either side of the boat). So, *insert shoulder shrug emoji*?

Hi,
Yes - possibly just a glitch on the unit, it does happen sometimes. Which files did you get with the latest recording in the sub-folder with the .SON files?
I have received your files, thanks, but still haven't had time to have a proper look. I did notice that there was no B000.SON file, which is usually the primary, although I don't think that should affect sidescan. Hopefully I will get a chance to look soon and I will update you.