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LSS-1 & lower unit.

Old 03-05-2012, 05:37 PM
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Default LSS-1 & lower unit.

I will be installing an HDS-7 with an LSS-1 on a 17 ft aluminum boat. It has a 140 hp outboard an I don't really see anything in the install manual regarding the location relative to the outboard. Will the lower unit cause any problems with what the transducer sees? I'm thinking I'll use a Sternmate Duo to mount both transducers. Any recomendations?
Old 03-05-2012, 05:39 PM
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It can - on many boats you need to trim up the motor some to have a fully clear side view. A SternMate will unfortunately only push it further into obstructed view.
Old 03-05-2012, 08:08 PM
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My brother put a Humminbird 9XXX on his 221 (notched transom) and has to trim up to get the one side. Even at that he says its compromised.

That said, I'm looking at putting HDSs on my boat because I was so impressed...trying to figure out my ducer options now as well.
Old 03-06-2012, 03:43 AM
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I've got a HDS5 with the LSS1 on a 17 foot Fiberglass boat. Both transducers are mounted directly on the port side of the transom, the LSS1 transducer about 4 inches inboard and lower than the original. The structure scan transducer is about 18 inches from the 140 Hp outboard. At very low speed below about 3 knots I get a good picture from both sides. About 3 knots to about 6 knots the engine does have to be tilted up slightly to get a good return from the starboard side. Above 6 knots the side scan picture deteriorates but the down scan works up to about 25 knots. Hope this helps.
Old 03-06-2012, 12:44 PM
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Thanks for the feedback. I talked to Lowrance and got about the same answer from them. They recommended mounting the transducer as close to the center of the boat as possible. and putting the 83/200 transducer within about a foot for the best results with the structure map feature, which makes sense. I did ask him about mounting them close together. I'm thinking about putting them on a SternMate Duo system. That would only place them 4" apart or so. He didn't think that was a good idea, that there could be some interference with each other, though I don't really see how given they are different frequencies. The SternMate though would probably increase the likelihood that I will have interference issues with the lower unit since it will move the mounting surface about 2" aft of the transom. I'm still thinking about the SternMate idea.
Old 03-06-2012, 12:57 PM
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Originally Posted by 68bucks View Post
Thanks for the feedback. I talked to Lowrance and got about the same answer from them. They recommended mounting the transducer as close to the center of the boat as possible. and putting the 83/200 transducer within about a foot for the best results with the structure map feature, which makes sense. I did ask him about mounting them close together. I'm thinking about putting them on a SternMate Duo system. That would only place them 4" apart or so. He didn't think that was a good idea, that there could be some interference with each other, though I don't really see how given they are different frequencies. The SternMate though would probably increase the likelihood that I will have interference issues with the lower unit since it will move the mounting surface about 2" aft of the transom. I'm still thinking about the SternMate idea.
The "put within a foot" is not for StructureMap, but rather for the StructureScan / 2D sonar overlay feature - and even then I think what is more critical is the forward/aft distance in these.....

I would also agree there should not be a frequency interference between the units, but there could potentially be waterflow / aerator resulting "intereference" ;?
Old 03-06-2012, 01:10 PM
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I run two HDS 5' w/LSS1. Both transducers are on the starboard side with LSS1 being 6 inches inboard and 14 inches from dead center. I get no interference at all. Remember the LSS1 isn't designed for high speed readings. Mine is out of the water at speed.
Old 03-06-2012, 01:14 PM
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Originally Posted by mwardncsu View Post
The "put within a foot" is not for StructureMap, but rather for the StructureScan / 2D sonar overlay feature - and even then I think what is more critical is the forward/aft distance in these.....

I would also agree there should not be a frequency interference between the units, but there could potentially be waterflow / aerator resulting "intereference" ;?
I thought the StructureMap was the overlay feature. I'll have to review that. I suppose the problem could be water flow related. Wouldn't be a problem with the StructureScan since it is mainly for low speed but it wouldn't be good if it messed up the 83/200 for high speed reading. Maybe I should use two separate SternMates or only use the SternMate for the 83/200 and mount the LSS-1 transducer directly on the transom.

I ordered the Lowrance equipment today so I need to decide really soon so I can get this installed ASAP. The weather is getting nicer and I'm really getting the itch.
Old 03-06-2012, 01:22 PM
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Originally Posted by 68bucks View Post
I thought the StructureMap was the overlay feature. I'll have to review that. I suppose the problem could be water flow related.
StructureMap is the new Gen2 feature that overlays the side-scan data onto your chart.



Gen1 (and Gen2) has the ability already to overlay the down-scan data onto the traditional 2D sonar, which is where xducer "alignment" is somewhat important. (as in the image in the lower left panel of this screen shot)



I've not heard many folks say they find this feature all that useful..... maybe if you are using a small screen unit (HDS5 or so) and can't afford to split views......

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