can be deducted or credit and multipliers lost if there are errors in the log data for a given contact. Depending on the scoring formula used, the resulting scores of any particular contest can be either a small number of points or in the millions of points. Most contests offer multiple entry categories, and declare winners in each category. Some contests also declare regional winners for specific geographic subdivisions, such as continents, countries, U.S. states, or Canadian provinces. The most common entry category is the single operator category and variations thereof, in which only one individual operates a radio station for the entire duration of the contest. Subdivisions of the single operator category are often made based on the highest power output levels used during the contest, such as a QRP category for single operator stations using no more than five watts of output power, or a High Power category that allows stations to transmit with as much output power as their license permits. Multi-operator categories allow for teams of individuals to operate from a single station, and may either allow for a single radio transmitter or several to be in use simultaneously on different amateur radio bands. Many contests also offer team or club competitions in which the scores of multiple radio stations are combined and ranked. Types of contests A wide variety of amateur radio contests are sponsored every year. Contest sponsors have crafted competitive events that serve to promote a variety of interests and appeal to diverse audiences. Radio contests typically take place on weekends or local weeknight evenings, and can last from a few hours to forty-eight hours in duration. The rules of each contest will specify which stations are eligible for participation, the radio frequency bands on which they may operate, the communications modes they may employ, which other amateur radio stations they may contact, and the specific time period during which they may make contacts for the contest. Some contests restrict participation to stations in a particular geographic area, such as a continent or country. Contests like the European HF Championship aim to foster competition between stations located in one particular part of the world, specifically Europe. There are contests in which any amateur radio station worldwide may participate and make contact with any other stations for contest credit. The CQ World Wide DX Contest permits stations to contact other stations anywhere else on