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ive got the same one.i rewired it to run a small 12 volt,works good but cant be used next to any other flasher..no interference rejection back then.another thing is that unit will go up to 300 ft hence the 300d name. ive got the manual for mine somewhere.ill take pics of the pages and post them here when I find it.
I have one with the manual. Still works, I use it for fun on occasion. A few years ago Lorance service still had the manual, they would Email it to you. Try customer service. Cone base is 1/3 of the depth and I run it off a 12 volt 7 amp battery. Manual has lots of info about fish identification bottom structure etc. I have a Garmin with GPS, a couple of newer hummimbirds, but the old ones work and are fun.
Dont worry about it then. I can probably figure it out alongside my elite 4 chirp on the boat. (Aside from the interference)
Just curious.. why take it out of its green box?its all contained in it and the back of the head unit the wires are all exposed but protected in its original box.its a good setup in its green box.jmo