1) Fishing equipment 
A downrigger is a device used while fishing using the trolling method, which places a lure at the desired depth. A downrigger consists of a three to six-foot horizontal pole which supports a cannonball (large weight) by a steel cable (generally stainless steel). A clip, also known as a `release` attaches a fishing line to the cannonball weight. .....
a device fitted to a boat that uses a cable and a heavy weight to troll baits and lines at a set depth Drag
A mechanical device that uses larger weights to get fishing lures or bait down to a specific depth and keep it there.
Used to slow troll most commonly used for kingfish and grouper. Standard equipment on the kingfish tournament boats.