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Here is an example of how i run a gangline.
You do not have to use any specific kind of cord, I really like the regular Green or clear plastic decoy line that comes in spools from most hunting stores (I can snap it off by hand with a good hard pull, it is tangle free, and it lasts a long time).
I use drops with the ganyon "also called "shrimp clips" (the silver clip) at the end of the decoy string that I clip to the main line (the heavy line) which doesn't have to be black, but I think it is better to keep it a dark color (i dredged this cheap-o Anchor line from S.W. in some darker color laytex paints that I mixed together.
The main thing about the line is to keep it down so if is a natural floating line, then ziptie something to weight it down (old nutz or bolts or fishing weights etc... if you keepo that line under your dogs swimming pawstrokes, it will not get tangled in them.
You can get ganyons at places that cater to commercial fishing , and at many sporting goods retailers get em in the packs of 24 or 18 ... they do not have to have a swivel on them.
I like to run a decoy every 4-6 feet and run lines that are usually over 100 feet each,
I used to run nothing but singles on long long single lines (or I'd run 2 off of 1 long single line ) but it meant that I needed 15-20 foot lines in the waters I like to hunt, so mostly I will run ganglines these days for the lions share of my deeks.
I will tie a 10 lb plate weight from a weight set to each end of the gang line.
I am a big believer is keeping maybe 6 or so singles interspersed in the mix to keep the spread looking a bit more natural and I have found that the strategy of keep ing a couple of deeks right off of the edge of the spread (so they look like they just got there and havent had a chance to swim into the flock yet) is helpful.
In regards to decoys, I run a mix of species, have noticed that pretty much anything with a black front and white back or rusty red front and white back (from hand made gunners to bleach bottles) works fine.
I have had good hunts with as few as 3 decoys, and god only knows how many we have run at times...
Hope this helps you guys.
Please really watch yourself, it is possible for a hunter (when alone) and running a boat, setting deeks, tripping over an excited dog (all in the dark and in a bad chop) to get into trouble, and I find that diver hunting is often a team sport. 1 guy to run the boat, and the other guy or two to deploy the rigs.
Best ...
Todd