Complete NTM 52/22

Latitude: 55º 57.675’N                                                         Longitude: 004º 48.864’W

WGS 84 Datum                                                                      WGS 84 Datum



Mariners are advised that starting 05 November 2022, ground investigation works (boreholes) will commence both on the shore and on the water at Gourock Ferry Terminal, Gourock Bay, Firth of Clyde.

The work is expected to be completed within 5-6 weeks and will be undertaken from vessel (jack-up barge) OCM80 pictured below. The vessel is not self-propelled and when required, will be manoeuvred under tow.

With reference to the illustration below, the barge will remain in position 2 at the North end of the “topwires berth” until the morning of Tuesday 15 November. The barge is then expected to shift to a location in the proximity of the Kilcreggan steps to continue in the ground investigation works.

These dates may be subject to change so please contact the port on 01475 650 100 (Press Option 2) for an exact sitrep.


Vessel OCM80 will then be undertaking a multitude of other boreholes in the vicinity of the ferry terminal and nearby areas for the following four weeks.

Communication will be maintained with CalMac Ferries and others as required via VHF radio 12 and 16 throughout all ground investigation works.

All vessels navigating in the vicinity of Gourock Ferry Terminal, Gourock Bay, during this time are requested to maintain a lookout for the jack-up barge and pass at a safe distance and speed to minimise the effects of wash on the vessel.

Unless otherwise promulgated, information regarding the current status of NTMs can be found at therefore if the NTM is still ‘Active’ then it is still in force.

This NTM replaces 51/22 which is now cancelled.

Further details can be obtained using the contact details below.


Issued on behalf of the Harbour Master

Caledonian Maritime Assets Limited


Categories: Uncategorized @gd