Making your boating experience easier and better. Our GDL (Gear Driven Limit Switch) lifts allow you to pre-set the lower and upper limits that the cradles will travel. In other words, if you forget to stop the lift as it is going down or up you do not have to worry about the cradles resting on the bottom or being too high where it may damage your canopy or boat house. This is a great safety feature. Our GD (Gear Driven) lifts are also compatible with our remote control, but they do not feature a limit switch.