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Mr Adams:Hi
One of the better less expensive sonars/fishfinders to purchase is the wreckfinder by Echo pilot with a 150m range ahead 75m range down and 150 3D sidescan display with GPS. this unit sells for around $1500 Canadian. If you have the cash you can pick up several midrange Canadian/US made tow behind sonars for around $6000 to $9000, from Shark Marine, I beleave Tom at NT uses one and he would be the better person to ask. I currently use the Fishers SSS-100K/600K dual frequency side scan sonar for work.
http://www.sharkmarine.com/
Good Luck
Almost all the wrecks in Kingston were found long before fancya$$ special side scan came into vogue.simcoediver:Unless you know the wreck is there it will be difficult to actually find one just using a good quality regular fishfinder, as you pass over a known wreck it will show up on the fishfinder but so will every pile of rocks and every clump of seaweed.It can be hard to distinguish between a wreck and other stuff on the bottom. Like Tom says you need to have top of the line sidescan sonar to actually find a new wreck.