We are new to sailing and need to replace the mainsail for a Northshore 27 we recently bought. We find the idea of measuring the mainsail a bit daunting. Can anyone help with mainsail measurements for this yacht? Also we are a looking at a cost effective sail for cruising, ideally we would like 2 reefing points and a fully battened sail. I understand reefing points and battens can be added if we buy a sail that doesn have these. Does anyone know if that is correct? We are in Sydney. Thanks