The latest SkyHook enhancements for Mercury joystick-equipped vessels are available as downloads from Mercury's GoFree store. They include Heading Adjust ($49.99), BowHook ($49.99) and DriftHook ($449; $499 for all three). Heading Adjust allows anglers to adjust the heading lock in 1- and 10-degree increments while SkyHook is active. BowHook unlocks the heading and maintains just the position. DriftHook maintains heading and unlocks position. The new features require Mercury's latest Joystick system and, initially, VesselView 703. Future updates will be compatible with other systems.