Harbour Operations
Harbour Operations point of contact: operations@cmassets.co.uk
Improving marine navigational safety in Oban Harbour
We continue to work in partnership with Argyll and Bute Council, Northern Lighthouse Board, CalMac Ferries Ltd and Oban Community Harbour Development Association (OCHDA) to improve communications and navigational safety in Oban Harbour.
The project began in 2014 due to the increasing volume of ferries, commercial and marine leisure activity. Following the introduction of Road Equivalent Tariff (RET) on the Oban to Mull route there was a significant increase in ferry traffic navigating Oban Bay making the work of with the partnership even more relevant.
We are delighted that the hard work and continued engagement with our partners and stakeholders continues to deliver improvements in navigational safety in Oban Harbour.
To date the partnership working has so far successfully delivered:
- A fully operational Oban Harbour website
- Introduction of VHF 12 as a harbour working channel channel
- Mariner’s Code of Practice
- Leisure vessel guide
- Regular key stakeholder meetings and ongoing engagement
- Regular review of navigational risk assessments
- Joint emergency exercises
Conservancy
As a harbour authority and marine facility owner, CMAL has a responsibility for the operation and maintenance of marine facilities and should ensure that these are in good repair and are fit for purpose. This is vital to ensure that any vessels using them can do so safely but also makes good business sense since regular maintenance supports continued effective and efficient operations, reduces costs in the long term and assets are maintained in good or better condition retain greater intrinsic value.
Hydrography
Harbour authorities have a duty to find, mark and monitor the best navigable channel or channels in the harbour. A statement of the measures adopted should be included in the published policies and plans. Effective arrangements to publish appropriate hydrographic information (charts, warnings about recent navigational hazards) must also be in place.
CMAL maintains a schedule of routine annual hydrographic surveys undertaken by its contractor Aspect Land and Hydrographic Surveys Ltd that over a 5-year period encompass all ports, harbours and other geographical areas where they have responsibilities throughout the Clyde and west coast.
The UK Hydrographic Office (UKHO) is responsible for compiling and publishing charts for all tidal waters around the UK, together with the Admiralty Sailing Directions and CMAL provides the UKHO with the results of all their surveys.
Aids to Navigation (AtoN)
As a local lighthouse authority (LLA) CMAL is required through UK commitment to SOLAS to operate in accordance with International recommendation and guidelines. For marine Aids to Navigation the standards are set by the International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA).
The method of measuring Aids to Navigation and the recognised availability standards are set for each category of Aid by IALA. These are published in the IALA Aids to Navigation Guide.
IALA states that the absolute minimum level of operational availability for individual aids to navigation is 95%. If availability of an individual Aid falls below this level then consideration must be given to withdrawing the Aid to Navigation from service.
The availability of the actual Aid to Navigation (e.g. whether the light is flashing correctly or a buoy is on station) is averaged over a 3-year continuous period. High levels of availability, which match or exceed internationally recognised standards, ensures that CMAL provides the service required by mariners in our hostile marine environment.
Categories of AtoNs
Each of the Aids to Navigation operated by CMAL is allocated an IALA category as follows:
Category 1
An Aid to Navigation that is considered by CMAL and the Northern Lighthouse Board to be of primary navigational significance. It includes the lighted aids to navigation that are considered essential for marking landfalls and primary routes.
Category 2
An Aid to Navigation that is considered by CMAL and the Northern Lighthouse to be of navigational significance. It includes lighted aids to navigation that mark secondary routes and those used to supplement the marking of primary routes.
Category 3
An Aid to Navigation that is considered by CMAL and the Northern Lighthouse to be of less navigational significance than Category 1 and 2.
Performance
AtoN Availability by Category
| IALA Category | No of Aids | Total Hours | No of Failures | Availability | Target Availability |
|---|---|---|---|---|---|
| CAT 1 | 5 | 131,520 | 1 | 99.97% | 99.80% |
| CAT 2 | 54 | 1,420,416 | 5 | 99.81% | 99.00% |
| CAT 3 | 10 | 226,560 | 0 | 100.00% | 97.00% |
| No Category | 0 | 0 | 0 | 0.00% | 0.00% |
| Totals | 69 |
Date Range from 12/06/2022 to 12/06/2025
How Performance is measured
Availability is measured by dividing total time (i.e. the sum of the total number of hours in a year multiplied by the number of Aids to Navigation in each category) into the difference between total time and the number of hours that the Aids were not available to the mariner. This calculation is then expressed as a percentage.
Improvements
CMAL is constantly looking for new ways to provide increased levels of information for mariners using our ports and harbours that will further enhance navigational safety and efficiency. To that end, CMAL has engaged with Hydrosphere Ltd and Aqua Power Technologies to put together a newly developed and cost-effective wave monitoring system. To date, buoys have been deployed near to Brodick and Tiree Ferry Terminals to assess the capability and reliability of the instruments before being considered for deployment at some other some other CMAL harbours.