Endurance and Offshore racing are the categories that push the limit of man and machine. Endurance races are competitions of long distances and/or times in rivers, lakes, and oceans. Competitors either individually, or in teams, must push their bodies, and watercraft, through grueling conditions, to complete the event. Offshore racing, usually takes place in the ocean and requires navigation skills. Endurance and Offshore racers compete on both Stock and modified watercraft with extreme speeds showcased. Competitors also must master fuel management and efficient pitting times in order to succeed at Endurance and Offshore events.