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Marathon Airport (CYSP) serves the town of Marathon on the north shore of Lake Superior in Ontario, Canada, offering general aviation and regional access to a fairly remote part of the province. It is an uncontrolled aerodrome operating on an Aerodrome Traffic Frequency, with a single paved runway suitable for light and medium general aviation traffic.
Marathon Airport, identified by the ICAO code CYSP, lies at Marathon, Ontario, Canada. It functions as a general aviation and regional aerodrome for the surrounding Lake Superior community, and is listed as a home base for at least one based aircraft.
The airport sits at coordinates 48.7571, -86.3458 at a field elevation of 1030 feet. It falls within Winnipeg-administered airspace, with Winnipeg Centre and a Winnipeg remote communications outlet available to pilots operating in the area.
Marathon has a single hard-surfaced, lit runway aligned 16/34. Runway 16 is 3927 feet long and Runway 34 is 3729 feet long, both on the same hard-surfaced strip. There is no ILS at the field.
Winnipeg Centre is available on 134.075 MHz, with a Winnipeg remote communications outlet (RCO) on 123.55 MHz for contacting air traffic services at distance. The aerodrome traffic frequency and UNICOM is 122.8 MHz, used for self-announced calls at this uncontrolled field.
As an uncontrolled aerodrome with an Aerodrome Traffic Frequency, pilots are expected to make position calls on 122.8 MHz to coordinate with other traffic in the vicinity and in the circuit, following standard Canadian uncontrolled-aerodrome practice.
Marathon Airport is tagged as offering avgas, and is recorded as a home base for at least one based aircraft, indicating ongoing general aviation activity at the field.
