I came across this great article on sighting for triathletes and think it’s well worth a read. Very thorough and timely, given I am racing this week.
The main point I would add is that it is important to practice sighting throughout the season, so that it is second nature come race day. Practice it in the pool as well as when training in the open water.
His video embedded here:
Worth a watch for some good tips and visuals. Practice them before your next race!