000			01047cab a2200229 4500
001			A149
008			090401t1991 xxu||||| |||| 00| 0 eng d
035			_a(Sirsi) u27292
041			_aeng
100			_aShipman, Stephen
245			_aDifferential GPS during hydrographic surveys in 1990
260			_c1991
350			_a0
490			_aLand & Minerals Surveying _v9(3) March 1991, 5-7(3)
520			_aWith the resumption of GPS satellite launches it was believed that at last, in 1990, the GPS would offer the RN Hydrographic Service a viable alternative to traditional land navigation systems. In late 1989 a tender exercise was conducted and a contract was let to Racal Marine Systems for the provision of three ship equipments and a Differential Service. This article describes the system and the results of an accuracy assessment carried out in March 1990.
650			_aGLOBAL POSITIONING SYSTEMS
650			_aHYDROGRAPHIC SURVEYS
650			_aPRODUCT REVIEW
690			_aLAND SURVEYING
942			_n0
948			_c04/03/1997
999			_c18369 _d18369