Hms Marconi Wreck

Surveying Details

H03280/41 17.10.41 INS DW WITH A G CAN BUOY GP FL(2)G 10 SEC CLOSE NW. - NM 2445/41 & FNM 2447/41. H03280/41 25.11.41 AMEND POSN. - NM 2793/41. H3280/41 18.9.43 AMEND TO WK 4FMS WITH A G CAN BUOY GP FL(2) G CLOSE NW. - NM 1977/43. H0393/42 30.10.43 DELETE BUOY. - NM 2339/43. H03280/41 19.12.50 AMEND TO WK 3FMS 1FT WITH A G CON BUOY GP FL 3G 10SEC. (TH). - NM 2460/50. H03280/41 30.10.51 WIRE DRIFT SWEEP BY SMLS 325 AND 323 17.9.51. CLEAR AT 22, FOUL AT 23FT. LEAST E/S DEPTH 25 IN GEN DEPTH 27FT. SCOUR DEPTH 42FT. SCOUR LIES 232 DEG, 710FT FROM WK BUOY. (HMS SHARPSHOOTER, 26.10.51). AMEND TO WK 3FMS 4FT. - NM 186/52. H03280/41 19.1.53 DELETE BUOY. (TH). - NM 125/53. H1144/65 3.8.65 LEAST E/S DEPTH 23 IN 27FT. MODERATE A/S CONTACT. POSN 515446N, 013030E. (HMS ECHO, 29.10.64). H2134/70 24.2.70 EXAM'D 13.6.69 IN 515447N, 013029E [OGB] USING HIFIX [2 LOP]. SWEPT CLEAR 7.2, FOUL 7.6MTRS. GEN DEPTH 8.9MTRS. SCOUR DEPTH 9.8MTRS. POOR SONAR CONTACT. (HMS ENTERPRISE). AMEND TO SW 4FMS (SW 3FMS 5FT LAT). BR STD. H3186/73 8.5.73 EXAM'D IN 515448N, 013030E [OGB] USING HIFIX [2 LOP]. LEAST E/S DEPTH 7.1 IN GEN DEPTH 10.8MTRS. SCOUR DEPTH 9.4MTRS. (HMS ENTERPRISE). H4358/74 11.2.76 EXAM'D IN 515448N, 013030E [OGB] USING HIFIX [2 LOP]. LEAST E/S DEPTH 6.8 IN GEN DEPTH 8.5MTRS (HEAVY SEA RUNNING). NO SCOUR. LIES 065/245 DEG. LENGTH APPROX 50MTRS. NOT FULLY SURVEYED. (HMS ECHO, HI 12/75). AMEND TO WK 6.8MTRS. - NM 471/76 H4726/77 16.3.79 LOCATED IN 515448N, 013028E [OGB] USING HIFIX. LEAST E/S DEPTH 7.5 IN GEN DEPTH 8MTRS. SCOUR 8.9MTRS. INVESTIGATION RATHER INCONCLUSIVE. VICINITY OF WK DOMINATED BY SANDWAVE ORIENTATED NW/SE AND IT IS PROBABLE LEAST DEPTH OBTAINED WAS OVER THIS RATHER THAN THE WK. (HMS ENTERPRISE, HI 60B/78). NCA. H2007/81 16.2.81 EXAM'D 26.11.80 IN 515446N, 013026E [OGB] USING HIFIX [2 LOP]. SWEPT CLEAR 7.6, FOUL AT 7.8MTRS. LEAST E/S DEPTH 7.6 IN GEN DEPTH 8.5MTRS. LYING NW/SE ON TOP OF A BANK AND IS ENCOMPASSED BY A RIDGE 0.5MTRS HIGH TO THE N. ABOUT 27MTRS LONG. HEAVILY SILTED. (HMS ECHO, HI 68B/80). AMEND TO SW 7.6MTRS. BR STD. H1955/80 25.3.82 EXAM'D 17.11.81 IN 515450N, 013024E [OGB] USING HIFIX [2 LOP]. SWEPT CLEAR AT 7.5, FOUL AT 7.8MTRS. LEAST E/S DEPTH 8.8 IN GEN DEPTH 8-9MTRS. SCOUR 1MTR, DCS3 HT 2MTRS. LYING 040/220DEGS. LENGTH 33MTRS, BREADTH 10MTRS APPROX. (SOISS, HI 25). NCA. H2913/83 18.10.84 NOT LOCATED. NO SPECIAL SEARCH MADE. (HMS ECHO, HI 192). NCA. H4024/86 17.2.88 EXAM'D 4.9.87 IN 515450N, 013023E [OGB] USING TRISPONDER [4 LOP]. LEAST E/S DEPTH 7.6 IN GEN DEPTH 8MTRS. SCOUR DEPTH 10.5MTR. DCS3 HT 1.4MTRS (?). GROUP OF SMALL SONAR CONTACTS OVER AREA SOME 85 X 50MTRS WITH NO SPECIFIC ORIENTATION. LIES ON W EDGE OF BANK WHICH HAS LEAST DEPTH 7.3MTRS. ANOTHER 200MTRS SE HAS DEPTH 6.9MTRS. MAG ANOMALY INDICATES IRON CONTENT OF MAX OF 11 TONNES. (NP 1016, HI 373). RETAIN AS SW 7.6MTRS IN REVISED POSN. BR STD.