As the banner says, if you qualify, you can log it. All OCNA Challenge caches are locationless type, arranged as Geo-Art in The Gulf of Mexico.They are all "unknown" (?) caches, owned by a special Admin account, OCNAChallenges. Do you have an idea for one? Feel free to contact us.
Lonely Cache Combination: Even in the most active areas there are caches that are lonely, having not been found for extended periods of time. To be a Combo Finder:
Find 3 OCNA caches that have not been found for at least one full year.
Find 2 OCNA caches that have not been found for at least two full years.
Find 1 OCNA cache that has not been found for at least three full years.
The previous "found" log must be dated the appropriate number of years prior to your "found" log.
A First to Find log is acceptable provided that the hide date meets the age requirement for each element prior to the first find log entered.
Cross listed caches are also acceptable provided that they have not been logged as found on any other listing service during the same period of time.
For this Challenge Cache you may include caches that were used to qualify for other Lonely Cache levels.
Verification: Please post your qualifying finds with your log, preferably in the http://coord.eu/OUXXXX format, and also keep in mind you can link to cache pages using our cache log editor, although is not mandatory. To see if you qualify, you can just look through your list of finds in your profile, but keep in mind, we do have the equivalent of a Groundspeak "my finds pocket query", (instructions here) and that .gpx file is easily imported into GSAK, or any similar stats program. We recommend a "gpx gc" file, and we also recommend GeoGet as a free alternative to GSAK, should you not be a paid full version user of GSAK.