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Hard bottom on a Furuno

Old 02-22-2013, 09:12 AM
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Default Hard bottom on a Furuno

Attached below is a screenshot of what the manual has to say about bottom density.

Is looking at hard bottom really as cut and dry as that image?

Sometimes I see what looks like the "rock base" part of that image inverted with the layer of yellow/blue on top when looking for rocks 150 to 250 ft. Would water depth make a rock look like that... or would that layer of yellow be fish. From experience in fishing those types of places, it's not vegetation. I do pull up fish, but I'm not sure the fish are distributed evenly enough above the rock to make sense of the solid yellow/blue layer displayed on top of the entire rock as I drift over it.

Is there anything else to consider for looking for hard bottom?
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Old 02-22-2013, 09:40 AM
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With so many different sonar transducer combinations it seems that determining bottom type at times takes a bit of experience....but simply put... the harder the bottom the more intense the red on the screen.


My question to you is are you marking fish when you catch them?

Now with the higher quality sonar circuits and transducers available marking fish on or near bottom has become very easy....and concern over bottom type is less critical.
After all..if one is marking fish...that is the key right there.



Last edited by semperfifishing; 02-22-2013 at 09:53 AM.
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Old 02-22-2013, 10:52 AM
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Thanks, I may be muddying my experience between my last setup and this one when comparing to rockfishing like I did.

I have a 1k airmar thru hull transducer, and it marks fish, bait, and even market squid well. I'm pretty confident in the equipment, it's just my knowledge I'm questioning.

The reason I'm trying to understand reading bottom better is for scouting habitat. Right now, lobster and halibut are what I'm often targeting. Not critters you can really see on a fishfinder, so I want be more confident about where I drop my hoops or start my drift.

Thanks for confirming about the thicker red. I've honestly been focused on contours more than density so it will be nice to get out there and prospect with a different mindset.
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Old 02-22-2013, 12:16 PM
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Read the "tails" and here in FL, I fish the hard bottom even if I don't see a great "show" of fish. There is a great instructional thread about this in the Florida/Georgia regional forum by "grouperkng". Don't know if it will help you or not but here it is...

link:
http://www.thehulltruth.com/florida-...e-updated.html
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