Similar to the idea of using the REI Ascenders, ATN created a device that allows you to go up alone. The Topclimber comes with a seat that you wear and can't fall out of that has one ascender attached and a pair of foot loops that has another ascender. A 9/16 line is run through the ascenders, tied to the main halyard and cranked up. The loose end is taken through a block on deck back to the main winch and tightened up. To go aloft you stand up on the foot straps, advance the seat up, sit down and advance the foot straps, repeat. It's not as easy as having your crew crank you up, but it's secure, safe and you can go up when you have no crew around. To get down, you just reverse the process.