=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Gronskar            050/151 RLR(1930) is 9.0m below BM171M
=========================== BENCHMARK INFORMATION UPDATE ADDED  12-JUL-93 :
Gronskar            050/151 RLR(1930) is 9.0m below BM171M
Gronskar is an historic station last data 1932

