Tacking with the centre main is just a little more complicated, with some potential to get your hands tangled in the middle. On the other hand most people find centre mainsheets to be much easier for controlling larger sails, which is why they are common on the faster racing boats.

1. Look around, make sure you're not going to turn into someone.
2. Let the mainsheet out slightly, but keep the mainsheet in your front hand and the tiller in your aft hand
3. Make sure the boat is balanced (flat) and is moving - it won't tack if its stopped
4. Your front foot should be on your side of the boat, your back foot across the other side.
5. Face forwards. Push the tiller away with the back hand, reaching across the boat.
6. As the sail flaps turn so that your whole body is facing forwards as you duck under the boom when the boat goes through head to wind. Don't move your feet, just let them pivot on the spot.
7. Continue to turn your body and flip the tiller extension round the tiller so it is now pointing the correct way for the new tack.
8. You are now almost holding the tiller extension behind your back with what is about to be the new front hand. Keep hold of the mainsheet and swap the tiller extension into the new aft hand, and take the mainsheet with the new front hand.
9. As the sail fills on the other side pivot round again and sit on the side of the boat.
10. You are now sitting with tiller in aft hand, sheet in front hand, aft foot on the opposite side of the boat.
11. Pull the sheet in and get back up to speed.