Update September 26, 2026: According to their QRZ page, QSL will be available only via eQSL, what would be a real pity because it will invalidate the operation for the IOTA award.  Let's hope they will rectify and accept confirming by valid ways.

Active throughout September,  the special callsign  OC100ISL  marks the 100th anniversary since the inauguration of the Peruvian Navy's base on San Lorenzo Island (SA-052).  Amateur radio operations from the island are planned for September 25-27, 2026 only; at other times the callsign is operated on various bands and modes from mainland Peru.

More information and QSL info at QRZ.com