Seamaster watches are built to withstand the rigours of some of the most demanding sports including diving and sailing. Omega produces the Seamaster in several versions: the Seamaster Planet Ocean, the Seamaster Aqua Terra, the Seamaster 300 M, the and the Apnea. The Seamaster is an excellent dive sports watch and is available in two sizes and a chrono version. The Seamaster 300 M Racing Chronometer is the ultimate yacht racing watch.