The Pocket Guide to Sea Fishing Rigs is one of a series of three pocket guides published by the RYA - the other two being on Sea Fishing Knots and Sea Fishing Baits.
In it, the author Jim O'Donnell explains by way of nicely drawn sketches and descriptive text, how to make 15 of the most effective boat and shore rigs.
Each description is accompanied by Jim's advice as to the situations in which the rig might be used and identifies the fish species likely to be your target.
Downrigger ~ The cranelike device incorporating a line-counter reel often seen on the sterns of sport-fishing boats, which lowers a trolling weight on a wire line to a pre-determined depth. The trolling line is attached just above the weight, which gets the lure down to depths that would otherwise be unachievable.