Survey Identifier: SUB6672A
Format Acronym: MGD77
Data Center File Number: 09990015
Parameters Surveyed Code: 50000
File Creation Date (yyyymmdd): 19991123
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): 19660101
Survey Arrival Date (yyyymmdd): 19721231
Topmost Latitude of Survey: 87
Bottommost Latitude: 81
Leftmost Longitude: -081
Rightmost Longitude: -043
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: 8249
Min/Max Data Record:
Latitude: +81.41940
Longitude: -80.00830
Bathymetry, 2- Way Traveltime: 001149
Bathymetry, Corrected Depth: 86.0
Min/Max Data Record:
Latitude: +86.72790
Longitude: -43.95840
Bathymetry, 2- Way Traveltime: 032951
Bathymetry, Corrected Depth: 2417.0