Parker Reef, lying approximately one-half nautical mile north of northern most tip of Orcas Island, has long been on the San Juan County Marine Resources Committee's "11 Most Frequently Hit Rocks or Reefs in the San Juans" list. Although marked with a lighted nav aid beacon, Parker Reef extends in every direction and has caught boaters trying to "cut corners". It is recommended to give Parker Reef a wide berth, and have proper charts on hand.