=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Sultan Shoal        555/021 RLR(1986) is 10.2m below Brass Bolt
=========================== BENCHMARK INFORMATION UPDATE ADDED  12-JUL-93 :
Sultan Shoal        555/021 RLR(1986) is 10.2m below Brass Bolt
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Oct-2010 :   
Benchmark for the period 1969-1979 was Dampier Survey 'T' mark 6.500m above
Datum 1969-1985. 1980-1985 benchmark was Brass Bolt 5.004m above Datum
1969-1985.
1986 onwards the ACD changed to 4.922m below the Brass Bolt. In 2009 a new
jetty was re-constructed ACD remained the same while Primary benchmark is now
Cut Mark 4.941m above ACD.
Because of the building of the new jetty there is a gap in the data Jan 2008-
Sept 2009.

