Notice to Mariners No 77 of 2026 (Temp)

Monday 12 October 2026

HARBORS AND NAVIGATION ACT 1993

Notice to Mariners No. 77 of 2026 (Temp)

SOUTH AUSTRALIA – SPENCER GULF – WHYALLA – GEOTECHNICAL INVESTIGATIONS

Mariners are advised that there will be geotechnical investigations operating off Mullaquana from 23^rd October 2026 to approximately end of January 2027 at following locations.

Latitude Longitude

Borehole Location 1 33°14'15"S 137°26'45"E

Borehole Location 2 33°14'22"S 137°27'01"E

Borehole Location 3 33°14'33"S 137°26'58"E

Borehole Location 4 33°14'08"S 137°26'50"E

Borehole Location 5 33°14'20"S 137°26'40"E

Borehole Location 6 33°14'26"S 137°27'19"E

Borehole Location 7 33°14'44"S 137°27'23"E

Borehole Location 8 33°14'34"S 137°27'35"E

Borehole Location 9 33°14'27"S 137°27'41"E

Borehole Location 10 33°14'19"S 137°27'15"E

Mariners are advised to navigate with caution in the area.

Charts affected: AUS136, AUS485, AUS778, AUS4709

ENC AU160120, AU240130, AU434137

Gordon Panton

Manager Marine Safety and Compliance

Department for Infrastructure and Transport

12 October 2026

DIT 2017/02277/01