False casting – When fly fishing, a forward casting action used to gauge the ideal distance of a cast or to increase the speed of a line and resultant distance.
Fast-action rod – A rod with a stiff butt and mid section with most of the bend in the tip.
Feathers – once used to apply to lures which comprised dyed feathers whipped to a hook this term is now a generic name for any small lures fished paternoster style.
Fighting chair – A swivel chair bolted to the deck of a big-game boat. The angler is strapped in by a harness and either the harness or the chair is equipped with a butt pad or rod socket.
Filleting knife – A thin bladed, sharp knife used to clean and fillet fish or cut squid and fish baits.
Fishfinder- An electronic device that is used to detect depth and the nature of the seabed beneath a boat. Depending upon the set it may also be possible to identify both shoals of fish and in shallow water single fish.