Other Interest > DIY - Side Scan Sonar and towfish

what's the small horirontal line on picture

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abraquelebout:
hi
i join a picture take on river for a survey
there's lot of horizontal small line on it and i don't know why
i hope a small vibration...
this picture is at 800 khz
i join the same in 455
rickard do you have an idea?
this picture is take by a 898 si

Humminbird_Greg:
Question: do these horizontal lines show up when viewed on the unit or is this only when viewed with the DeepView software?

Rickard:
I think the lines are difficult to see. If this is your main interference problem, I think you are lucky. My images usually show a lot of various sorts of defects, most of them are interference caused by the engine. Did you use the towfish and the long cable at this occasion?

Rickard

abraquelebout:
hi every body
in this sequence i use towfish , 60 meter of cable .
there is only 6 m over the boat and the rest in large   buckle on a aluminium boat.
i don't see the interference on the 898, the sreen is smaller than the 1197. i just remark them on deepview. i havent see this small line before
may be electric or eletromagnétic ?

RGecy:
It may be from using the HBSI converter.  I use a filter in the program to clear up the center water column and that may be what you are seeing in your images.

I can eleiminate it, but there is a lot of clutter.

Robert

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