Boat speed is at idle when slow trolling simply maintained by slipping one engine into gear for a few seconds and doing the same with the other one. Usually the skipper faces aft, working the clutches to his rear. When the sailfish takes a bait, it's usually seen. For natural baits, trolling speeds of 4 to 5 knots seem to work best. With artificials, the boat moves a little faster-- 6 or 7 knots. High speeds, 8 to 10 knots, as used for marlin and school tuna, are not very effective.