=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 05-May-1994
UP TO 1985 LEUPOLD & STEVENS GAUGE, 1985-1993 (OCTOBER) OTT GAUGE,
1993 (OCTOBER) - SONAR RESEARCH GAUGE
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Mar-2002
Tanajib Pier data 1995 suspect (shows doubling in range) and deleted.