Something I’ve found to help students when they’re learning to gybe is to separate the gybe from the act of turning the boat. A gybe can require no turning at all, and understanding this will improve your gybes and reduce your likelihood of capsizing.
Most of the time, the reason we are gybing is because we want to turn and go the other way while sailing downwind. Maybe we've reached Ashby Ave and we have to head back before we start to feel the disapproving glare of the day leader through their binoculars. Or we're doing tight circles around a buoy and have to keep turning through the gybe. But really, gybing has nothing to do with turning, other than if we're turning downwind, we have to eventually gybe or we just can't continue the turn.
The gybe itself is nothing more than changing tacks (from port to starboard or vice versa) while sailing downwind. Or to put it more simply: a gybe is flipping the sail from one side of the boat to the other. If you’re on a dead downwind run, there is no turning needed. In fact, there are reasons to gybe that don't involve a turn at all. A common case is during racing--if you're on a dead run and want to obtain right of way by switching from port to starboard tack. No turning needed. Or maybe you're headed back home and the wind shifts a bit and you realize you're now sailing by the lee, so you flip the sail to get yourself out of accidental gybe territory. No turning needed.
I've noticed a lot of students (understandably) connect the turn and the gybe and want to turn through the gybe, from broad reach to broad reach, which can often result in a capsize. To help disconnect the two actions I've started doing this exercise:
I've found this tends to create a light bulb moment and hopefully makes gybing in general a little smoother.
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I don't think I'd encourage correlating wind direction with landmarks. One of the most widespread problems at the club is sailing to landmarks rather than to the wind, a habit strongly encouraged by the fact that 90% of the time the wind comes from the direction of the Golden Gate. When you go to line up a COB close reach, for example, it is hard to scrub the nearly automatic frame of reference if the wind is S, E or N. Plus, it can shift pretty rapidly, so that one approach to a COB requires a different line than the next, and heading dead down wind may require you to sail in an arc.
Yea I'm on the fence about that part for that reason, and I don't always mention it, depending on how the student is doing. This is a temporary exercise though, just to get them to stop turning too much to gybe. If using the horizon helps, I'll let them for this, and I don't think it instills too much of a sense of 'ok to be on a run, I should always be pointing at that building'. Also, I have them get on a run before mentioning using a horizon reference point. If they can get there first, the use of the horizon is minimal.
On a dead run, you have some pretty good indicators on the boat. Ryan mentioned one in a way I hadn't thought of - the jib, and trying to keep it more or less centered. That makes sense. And also you have the main sail. With someone's hand on the boom, you can feel when it's getting back-winded. The yarn on the shroud is OK, too. And although the wind will shift, the angle of the boat to the swells isn't all that bad in most cases.
I teach to watch the jib as the downwind indicator, since it's directly in the skipper's line of sight.