Troll or Speed w/ Trol-A-Matic on your inboard-outboard or outboard. Inexpensive Lightweight Easy to InstallTrol-A-Matic is ideal for all kinds of fishing under all types of conditions. Constructed of fiberglass filled nylon to eliminate corrosion and rust. Once installed, skipper has complete range of speeds from which to choose, from very slow, ideal trolling speed to wide open throttle with no interference whatsoever! This revolutionary trolling device is completely automatic and swings up as speed is increased.