Lowrance Structure Scan Sidescan Gen2

5 years 6 months ago #25848 by TwoDogs1969
TwoDogs1969 created the topic: Lowrance Structure Scan Sidescan Gen2
Does anyone have any feed back on the Gen2 Structure Scan. What Depth does it seem to work to? Whats the Down Scan like and what depths is it good to? I would be mainly looking at this for wrecks to 120m.

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5 years 6 months ago #291607 by whodidwhat
whodidwhat replied the topic: Lowrance Structure Scan Sidescan Gen2
Twodogs
No recreational hull mounted Side imaging unit out there or likely to be manufactured will able to get that sort of depth and act as side scan. If some of the top end multi beam become commercialised they may be able to do that sort of work but not a hull mounted side scan.

This is because of several reasons

Frequency = Resolution - higher frequency better resolution but less water penetration (physics) most of the commercialised side imaging units (Lowrance and Hummingbird) are using high frequencies (455 and 800 kHz to give good pictures) but this then means they have very limited water penetration the depths that you are suggesting would require around 100kHz to do that sort of work (and high power output). As an example your standard boat sounder is working at 50 and 200 kHz so giving much greater penetration than the frequencies that are being used in the SI units

Additionally any side scan is typically aiming to be 10% of the scan range off the bottom to give the shadows behind targets (eg a 100m scan range the fish would be 10m off the bottom so in your 120m example the fish should be flying at 110m meters deep so needing approximately 200 to 300m of cable out to allow the fish to get to that depth).

In relation to the LSS2 I had an email through from someone in the last week or two who had one when I asked a similar question described it as

quote:



As far as the structure scan gos very good down to about 20 meters in side scan down scan about 30 meters after that forget it.



Have a look at www.thehulltruth.com/marine-electronics-...rst-impressions.html for a good review (plenty of real life pictures) of the comparison between the LSS1 and LSS2

Or look at Jason M unit www.ebay.com.au/itm/Wesmar-SHD700SS-Side...&hash=item4d02bd45ef or wait around a few months and we will be putting a spare unit up for sale (about twice what Jason is looking for)

Scott W

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5 years 6 months ago #291610 by TwoDogs1969
TwoDogs1969 replied the topic: Lowrance Structure Scan Sidescan Gen2
Thanks Scott
I am thinking of a backup sounder and thought if the SSC units are any good they might be worth it. What about the down scan part does that work deeper and also what type of speeds will they work the one i have now works really good but only at very slow speeds.

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5 years 6 months ago #291613 by whodidwhat
whodidwhat replied the topic: Lowrance Structure Scan Sidescan Gen2
If its a back up unit hold off as long as you can. - The broadband sounders and Chirp sounders are just starting to be rolled out / more common so after a year or two their price should fall back into the realm of being realistic and they will give you much better performance.

Also many of the units are now starting to go with more software based interfaces (think cheap 10 android tablet as a screen) or linked back into a GPS and or computers so allowing the integration with software like openCPN opencpn.org/ocpn/ and or DrDepth www.drdepth.se/ or GlobalMapper www.bluemarblegeo.com/global-mapper/ or Piscatus www.piscatus.co.nz/

If you have to get something go for a unit with a very narrow beam angle not something with a 20 deg cone angle (typical for many units) at 41 meters of water you have a circle on the bottom of almost 15 meters diameter (163 m2 covered) so given a small target say 5m by 2m (boiler size - 10 m2) that is only 6% of area covered by the sounder so this height of the boiler is averaged out over that 163 m2 area. If the cone angle of the transducer was 8 degrees (also used) the diameter covered on the bottom drops down to 5m. So giving good crisp edges to structures

You can also narrow the beam angle of any sounder so giving better edges to structures by decreasing the sensitivity of a sounder. With low sensitivity settings, the effective cone angle is narrow, showing only targets immediately beneath the transducer and a shallow bottom. Turning the sensitivity control up increases the effective cone angle, letting you see targets farther out to the sides

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5 years 6 months ago #291615 by Bazza
Bazza replied the topic: Lowrance Structure Scan Sidescan Gen2
Scott ... I looked at this unit recently and I am thinking about getting one fitted. I got this from a very very good source close to the company.

"Structure scan down to 70 m v good. Reading from there to 100m downward.so-so."

For 95% of my work that will suit me.

regards Baz

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5 years 6 months ago #291616 by TwoDogs1969
TwoDogs1969 replied the topic: Lowrance Structure Scan Sidescan Gen2
How long till you get it Bazz

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5 years 3 months ago #293233 by Thomasclark
Thomasclark replied the topic: Lowrance Structure Scan Sidescan Gen2
With low sense settings, the operative cone weight is dogmatic, viewing only targets now beneath the sensor and a neuritic merchantman. Motion the sentience essay up increases the impelling confided weight, letting you see targets farther out to the side.

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5 years 3 months ago #293237 by TwoDogs1969
TwoDogs1969 replied the topic: Lowrance Structure Scan Sidescan Gen2
quote:

Originally posted by Thomasclark

With low sense settings, the operative cone weight is dogmatic, viewing only targets now beneath the sensor and a neuritic merchantman. Motion the sentience essay up increases the impelling confided weight, letting you see targets farther out to the side.




What?[:banghead:]

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5 years 3 months ago #293239 by PaulD
PaulD replied the topic: Lowrance Structure Scan Sidescan Gen2
Ignore it Scotty, its just a bot posting. Look at all the posts he has put up and none of them make any sense.

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