Survey Identifier: SUB7382H
Format Acronym: MGD77
Data Center File Number: 09990028
Parameters Surveyed Code: 50000
File Creation Date (yyyymmdd): 19991130
Source Institution: US NAVAL RESEARCH LABORATORY (CODE7420)
Country: USA/UK
Platform Name: SHIP UNKNOWN
Platform Type Code: 2
Platform Type: SUB
Survey Departure Date (yyyymmdd): 19730101
Survey Arrival Date (yyyymmdd): 19821231
Topmost Latitude of Survey: 79
Bottommost Latitude: 58
Leftmost Longitude: -178
Rightmost Longitude: -149
Assumed Sound Velocity: 15000
Additional Documentation: DATA COLLECTED BY US OR UK NUCLEAR SUBMARINES, UNDER-ICE PATROLS. DIGITIZED, 1981-1984 BY US NAVAL RESEARCH LAB FROM ORIGINAL NAVIGATION LOGS AND ANALOG, ECHO SOUNDING RECORDS ANNOTATED IN FATHOMS AND FEET, DEPTHS CONVERTED TO, METERS AT 1500 M/SEC, NOT CORRECTED FOR SOUND VELOCITY. ESTIMATED ACCURACIES:, VERTICAL +/- 2 PERCENT, HORIZONTAL +/- 0.5 NAUTICAL MILE. DEPTHS CALCULATED, FROM (A)SUBMARINE DEPTH USING PRESSURE (B)DISTANCE FROM PRESSURE SENSOR TO, TRANSDUCER (C)TRAVEL TIME FROM TRANSDUCER TO SEA BOTTOM.
Number of Data Records: 8578
Min/Max Data Record:
Latitude: +58.96820
Longitude: -177.48830
Bathymetry, 2- Way Traveltime: 000536
Bathymetry, Corrected Depth: 40.0
Min/Max Data Record:
Latitude: +78.77580
Longitude: -149.15850
Bathymetry, 2- Way Traveltime: 052103
Bathymetry, Corrected Depth: 3852.0