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Bigkahuna, fair call on your ROV, i would say an ROV normally has a camera, 75ohms is solid core, making it a moot point if side-scan is as well, certainly an ROV places less stress to a cable...
I can certainly see advantages for ROV, given though, even a basic Humminbird & LSS-1 can easily do 15mtrs... and a basic mod to an LSS-1 (Extension cable & fish) 800khz will reach 21m in salt water... A ROV seems allot of work given the intended depth...
I spent last night reading & reading web pages on the Humminbird, and while allot of comparisons and some nice test with the two units, their objective was “finding fish”, and just because you own either unit, even for years, doesn’t mean they know how to use it...
Fair to say, the expectation is that fish should come with “labels” that a fish finder should state it is a Bait fish, Tuna or Marlin... They have no idea even if an Octopus was hanging off their transducer or if all 8 arms were waving to them in a side-scan, they would still never see it along with most other fish for a multitude of reasons... (For me fish just get in the way of a nice scan)
In summing up in my opinion, the Hummingbird is what it says it is, a “side scan” unit, very strong in terrain aspects... Their early version was a technical correct down-scan... Weaker in detailing objects on the ground....
Lowrance structure scan is what it says it is, a “structure scan”... very strong in detailing objects on the ground, (A fictional down-scan based on fact) allot weaker in dealing with terrain aspects.... Ideally one of each solves most problems...
The att image (if this works) while deep for an 800Hkz (sea water 18mtrs) high lights my point...
Generally speaking side-scan loves flat bottoms, no obstacles, allot of open space to work in... Sadly my projects have none of that, steep terrain, rolling hills, 20/40m cliff faces, submerged caves, sinkholes, tall trees, poles, building & bridges... etc, but only down to 50mtrs...
So i started in April this year with a friend’s Lowrance Burton( 100m cable,200Khz Left-scan) who up-dated to a Sea King (150m cable, max depth 40mtrs 325Hkz Chirped, LR 200m SS) (mega bucks) even with only 10m of cable out, while they failed miserably
came home, yep love side-scan and since April tried to sort out way to scan this area for a trip next year...
Hence, my LSS-1 has as many mod’s i can think of to scan the project.... I all ready know my little fish is going to get his little face smashed in, that’s life, so he has got to be bullet proof along with functional for the project... (cables being pulled out is not unthinkable)
With the Humminbird, i couldn’t find any clear-cut results, given extension to the fish, power drop issues, problem solving, over true distance / scan results... easy to say you can run one 100m down, but we all know the power drop means it most likely doesn’t work... so what is a Fair-dinkum result..?
Cheer Stu
Bigkahuna, fair call on your ROV, i would say an ROV normally has a camera, 75ohms is solid core, making it a moot point if side-scan is as well, certainly an ROV places less stress to a cable...
I can certainly see advantages for ROV, given though, even a basic Humminbird & LSS-1 can easily do 15mtrs... and a basic mod to an LSS-1 (Extension cable & fish) 800khz will reach 21m in salt water... A ROV seems allot of work given the intended depth...
I spent last night reading & reading web pages on the Humminbird, and while allot of comparisons and some nice test with the two units, their objective was “finding fish”, and just because you own either unit, even for years, doesn’t mean they know how to use it...
Fair to say, the expectation is that fish should come with “labels” that a fish finder should state it is a Bait fish, Tuna or Marlin... They have no idea even if an Octopus was hanging off their transducer or if all 8 arms were waving to them in a side-scan, they would still never see it along with most other fish for a multitude of reasons... (For me fish just get in the way of a nice scan)
In summing up in my opinion, the Hummingbird is what it says it is, a “side scan” unit, very strong in terrain aspects... Their early version was a technical correct down-scan... Weaker in detailing objects on the ground....
Lowrance structure scan is what it says it is, a “structure scan”... very strong in detailing objects on the ground, (A fictional down-scan based on fact) allot weaker in dealing with terrain aspects.... Ideally one of each solves most problems...
The att image (if this works) while deep for an 800Hkz (sea water 18mtrs) high lights my point...
Generally speaking side-scan loves flat bottoms, no obstacles, allot of open space to work in... Sadly my projects have none of that, steep terrain, rolling hills, 20/40m cliff faces, submerged caves, sinkholes, tall trees, poles, building & bridges... etc, but only down to 50mtrs...
So i started in April this year with a friend’s Lowrance Burton( 100m cable,200Khz Left-scan) who up-dated to a Sea King (150m cable, max depth 40mtrs 325Hkz Chirped, LR 200m SS) (mega bucks) even with only 10m of cable out, while they failed miserably
came home, yep love side-scan and since April tried to sort out way to scan this area for a trip next year...Hence, my LSS-1 has as many mod’s i can think of to scan the project.... I all ready know my little fish is going to get his little face smashed in, that’s life, so he has got to be bullet proof along with functional for the project... (cables being pulled out is not unthinkable)
With the Humminbird, i couldn’t find any clear-cut results, given extension to the fish, power drop issues, problem solving, over true distance / scan results... easy to say you can run one 100m down, but we all know the power drop means it most likely doesn’t work... so what is a Fair-dinkum result..?
Cheer Stu
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