- Radio Orienteering in a Compact Area
Radio Orienteering in a Compact Area is a variation of
Amateur Radio Direction Finding. ROCA is a timed race in which individual competitors use a topographic mapand a magnetic compassto navigatethrough diverse, wooded terrain while searching for radio transmitters.
ROCA is a
sportthat requires less athletic skill and more technical radio direction findingskills than ARDF. In a ROCA course, the radio transmittersput out very little power, typically 10 to 200 mW, and can be received over only very short distances. Transmitters may identify themselves in Morse codeor with voice recordings, and only transmit for ten seconds during every minute of the competition. The transmitters are physically small, and marked with a control card that is no larger than a typical postcardwith a unique number identification. Decoy control cards may be placed in the competition area, as well, to force competitors to locate the actual transmitting devices. Because of the low power and short distances involved, most ROCA competitors walk the entire course, and focus their attention on the radio direction findingtasks rather than navigation.
ROCA is not as popular as ARDF, and activity is limited to only active clubs in a few countries. ROCA events can be found today primarily in the
San Francisco Bayarea of the United Statesand in the People's Republic of China.
*Crystal, Bonnie KQ6XA (1998). [http://www.qsl.net/kq6xa/roca/roca.htm "Radio-Orienteering in a Compact Area: The New Walking Foxhunt"] . Retrieved Dec. 2, 2005.
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