The boat used in the game is called 'hee' while the oars are termed as 'nou'. Usually, only two boats take part in the contest. However, sometimes many beautifully decorated boats can also be seen participating in this game. The dimensions of the boat are variable. The boat can carry as many sailors as they want, the minimum being 20. The race starts with a ritualistic ceremony to Lord Sanamahi. Lord Sanamahi is the ruling deity of every Manipuri household who is worshipped for safety and protection.
Even the sailors are up for the festival by dressing up in nice traditional outfits. The teams have a Tengmai Leppa or captain who positions themselves at the bow of the boat. Judges too are appointed - one positions him at the starting line and the other at the finishing line. Supporters of both teams are present for encouragement. The supporters, who are the intrinsic part of the game, are known as hiban chenba or khongban chenba in Manipuri language.
Source: https://www.indianetzone.com/13/hiyang_tannaba.htm

Source: https://www.quora.com/When-are-the-grand-dragon-boats-used-in-the-boat-racing-festival-Hiyang-Tannaba-in-Manipur