=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 1999Dec07 : The Oyarvide gauge is on a tower and has a Leupold Stevens float gauge. It is far from the coast (about 10 nautical miles) and does not have benchmarks. It is not to be confused with another tower at 35 12 S 57 10 W which operated from 1966-1970 and had a gauge record with many interruptions.
Servicio de Hidrografia Naval Departmento Oceanografia Av. Montes de Oca 2124 1271 Buenos Aires ARGENTINA