Polish speed freaks get thrills on ice

Ice sailing in Poland is a popular winter activity, with ice over 20 cm thick. Known locally as 'boy', it is not an Olympic sport but is culturally significant. Boats can reach speeds three times those of summer sailing, requiring sharp reactions. Speeds can exceed 100 km/h, making it the fastest wind-powered sport. Races are quick due to the short ice season, ending by March.

Why do reactions need to be sharp in ice sailing?

What happens to the ice after the end of March?