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(Marine Survey Technician, Hydrographic Surveyor, Geomatics Technician, Oceanographic Survey Technician)
Science & Research
Salary
€32,000 - €65,000/yr
Level
Professional
Outlook
Growing
Sector
Science & Research
As a Hydrographic Survey Technician you map and measure the underwater terrain of oceans, rivers, harbours, and lakes using specialised sonar, GPS, and data-collection equipment. Your daily work involves operating survey vessels, deploying acoustic sounding instruments, and processing the data gathered to produce accurate nautical charts and seabed maps. You work closely with hydrographic surveyors, marine engineers, port authorities, and offshore energy developers, documenting all survey operations and contributing to detailed technical reports. In Ireland, you may be employed by the Hydrographic Office of Ireland, the Marine Survey Office, port companies, or private geomatics and offshore engineering firms. The role takes you into challenging marine environments, requiring both fieldwork at sea and desk-based data analysis.
Listen: a day as a Hydrographic Survey Technician
Your alarm goes off at 06:15 in Galway. Today's survey is in Galway Bay, mapping a section of seabed for a planned offshore wind cable route. You check the Met Éireann marine forecast and confirm sea state is within safe operational limits before heading to the harbour by 07:30. At the dock you run pre-departure checks on the survey vessel, testing the multibeam echosounder — a sonar system that sends fan-shaped pulses of sound downward to measure water depth across a wide strip of seabed — and confirming the GNSS positioning antenna is locked and accurate. You log all equipment serial numbers and calibration dates in the field record sheet, as required by the survey specification.
Leaving Certificate subjects such as Mathematics, Physics, Geography, and Technical Drawing provide a strong foundation for this career. The typical minimum entry route is an NFQ Level 7 Bachelor of Science or Bachelor of Engineering in areas such as Geomatics, Surveying, or Marine Science, offered at institutions including TU Dublin, ATU, and SETU. Some graduates enter with an NFQ Level 8 Honours Bachelor in Geomatics Engineering or a related discipline, which broadens career opportunities. A QQI Level 5 or 6 PLC award in Engineering or Science Technology may provide a stepping stone into a Level 7 programme. Professional development is supported through bodies such as the Irish Institution of Surveyors and Engineers Ireland, and technicians often work towards chartered or certified status with experience. Postgraduate qualifications in Hydrography or Oceanography can support specialist roles and international deployment.
Most technicians begin their careers as junior survey assistants or hydrographic data processors, gaining practical sea time and familiarity with specialist software. With three to five years of experience you can progress to a senior technician or project surveyor role, taking responsibility for survey planning and quality control on specific contracts. Further study, such as a postgraduate qualification in Hydrography or chartership with a relevant professional body, can lead to a fully licensed Hydrographic Surveyor position recognised under Category A or B of the International Hydrographic Organization standards. Experienced professionals in Ireland may move into project management, offshore energy consultancy, or specialist roles with bodies such as the Marine Institute or the Irish Coast Guard.
AI and machine learning tools are increasingly being used to automate the processing and classification of large bathymetric datasets, reducing the manual effort involved in seabed feature identification. Autonomous surface vehicles and remotely operated survey platforms are beginning to supplement crewed survey vessels, which may change the nature of fieldwork but is unlikely to eliminate the need for skilled technicians to oversee, validate, and interpret results. AI-assisted anomaly detection can improve data quality and efficiency, meaning technicians will increasingly need competence in digital data management alongside traditional survey skills. Overall, AI is reshaping the role towards higher-level data interpretation and quality assurance rather than replacing the profession.
→ Hydrographic Survey Technician (Current role)
Organisations in Ireland that employ people in this occupation.
Beggars Bush, Dublin 4
Conducts seabed mapping surveys of Irish offshore waters.
Rinville, Oranmore, Co. Galway
Operates survey vessels collecting hydrographic and oceanographic data nationwide.
Dún Laoghaire, Co. Dublin
Surveys Irish coastal waters to ensure safe maritime navigation.
Cork City, Co. Cork
Surveys harbour bed and approach channels for port operations.
Dublin Port, Dublin 1
Monitors channel depths and seabed conditions within Dublin Port.
Cork, Co. Cork
Performs offshore pipeline route and seabed surveys for energy clients.
Dublin and Cork
Provides hydrographic survey services for coastal and offshore projects.
Dunmore East, Co. Waterford
Deploys unmanned surface vessels for hydrographic data collection globally.
Dublin 2
Supports marine infrastructure projects requiring underwater survey data.
Dublin
Carries out dredging and pre-dredge hydrographic surveys at Irish ports.
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