DONATUS OSSAI
Surulere,Lagos
Summary
Skilled professional with extensive expertise in advanced surveying and mapping technologies, including EIVA Navipac, Naviscan, Naviedit, and Navimodel. Proficient in data analysis and project execution using SonarWiz, AutoCAD, HYPACK, ArcGIS, Oasis Montaj, Golden Surfer, and GINT Bentley. Demonstrates exceptional capabilities with TSS440 pipe tracker, USBL systems, echo sounders, side scan sonar, multi-beam echosounder, DGPS systems, sector scan sonar, sub-bottom profiler, sound velocity profiler, and total station equipment. Excels in multitasking and workflow prioritization in high-pressure environments, with a results-driven approach to automatic leveling and statistical analysis.
Overview
6
6
years of professional experience
1
1
Certification
Work history
Online Surveyor/ROV PT Trainee
Chevron
ABGAMI Field, Nigeria
09.2025 - 11.2025
- Operate itpm survey workflows using EIVA NAVIPAC, NAVIMODEL, and NAVISCAN tools.
- Produced precise drawings from survey data using computer-aided design software.
- Collaborated with architects, engineers, and planners to discuss project details.
- Executed meticulous mapping activities for creating reliable base maps.
- Compiled comprehensive survey reports for informing key decision-making processes.
- Initiated and maintained robust relationships with contractors and suppliers for successful collaboration.
Online Surveyor/ROV PT Trainee
Chevron
ABGAMI Field, Nigeria
03.2025 - 07.2025
- Maintain itpm survey using EIVA Navipac, Navimodel, Naviscan, and Naviedit tools.
- Utilised latest technology in performing accurate measurements and calculations.
- Utilised topographic maps and global positioning systems in conducting accurate land surveys.
- Executed meticulous mapping activities for creating reliable base maps.
- Conducted boundary analysis for accurate property delineation.
- Produced precise drawings from survey data using computer-aided design software.
- Managed multiple projects simultaneously under strict deadlines.
- Operated advanced surveying equipment with utmost precision.
- Gathered, organised and modelled data for reports and presentations.
Geophysicist
Aveon Offshore
Port Harcourt
12.2024 - 12.2024
- Prepare seabed survey plans using EIVA Navipac and Navimodel software daily.
- Operate Naviscan sensors with Naviedit and C-nav workflows for positioning.
- Process DGPS data and sound velocity profiles with EdgeTech equipment systems.
- Manage sonar operations using Edgetech Side Scan Sonar, magnetometer, and EchoTrac.
- Collect sub-bottom survey outputs using EdgeTech Discover tools and MagPick for the magnetometer.
- Run multi-beam depth capture using Edgetech Discover and sounders daily.
- Draft survey deliverables using AutoCAD, SonarWiz, and ArcGIS workflows.
- Create survey passages and post-process files using HYPACK and eChart tools.
Survey party chief
CNL/MPL/BSNL
ABGAMI
11.2024 - 01.2025
- Survey oil offloading riser systems and record dimensional checks with EIVA Navipac.
- Maintain riser survey equipment and update survey settings using NaviModel.
- Edit and verify survey files with EIVA Naviedit and Veripos equipment checks.
- Conducted extensive field surveys, improving project accuracy by over 95%.
- Ensured accurate data collection for successful site analysis.
- Collaborated with engineers to ensure project specifications were met.
- Assisted in the development of topographic maps through precise measurement collection.
- Organized regular team meetings, fostering better communication among members.
- Provided detailed reports with meticulous data interpretation.
Survey party chief
GHL/MPL/BSNL
OYO field, Nigeria
10.2024 - 11.2024
- Maintained hfl equipment and coordinated installations for site readiness.
- Maintained eiva Navipac, Veripos, Verify systems and supported Autocad drawings.
- Supported Microsoft Office suite workflows for day-to-day reporting and configuration.
- Performed Veripos DGPS operations and managed Sonardyne gyro-linked surveying tools.
- Installed and calibrated HIPAP and USBL systems for accurate range measurements.
- Integrated Ixblue GAPS M7 USBL SVP/CTD probe setups for operational trials.
- Deployed Seapath navigation, Valeport SVX2 current meters, and Digiquartz IPS sensors.
- Connected Ixsea ROV Gyro 2 and WROV systems to readiness checks.
- Managed Ixsea ROV verification, including seafloor sensor alignment and ROV logs.
- Conducted extensive field surveys, improving project accuracy.
- Collaborated with engineers to ensure project specifications met.
- Designed comprehensive layouts using CAD software, enhancing visual representation of sites.
Online Surveyor
CHEVRON/MPL
Agbami Field, Nigeria
05.2024 - 06.2024
- Conduct cathodic protection WROV surveys using underwater positioning and subsea tracking.
- Configure EIVA Navipac, Navimodel, Naviscan, and Naviedit for survey control.
- Operate Ixblue USBL, C-nav DGPS, sound velocity profiling, and EA400 echo sounding.
- Run SonarWiz, ArcGIS, visual soft sonar, and SoundVelocity workflows for survey mapping.
- Manage Sonardyne USBL, SVP/CTD probing, and Valeport SVX2 current profiling.
- Deploy Tritech profilers, Tritech Bathy Gen 5 mux, and Imenco underwater laser.
- Operate R2sonic TSS440, dvl & INS, and Edgetech DSS220 ROV-mounted sonar.
- Survey with SSS/SBP systems using twin cell continuous contact and fg monitoring.
- Compiled comprehensive survey reports for informing key decision-making processes.
Hydrographic Surveyor / Data Processor
Ikong Energy
Mobil Field, Nigeria
02.2024 - 03.2024
- Performed geophysical and geotechnical surveys using EIVA, Navipac, Navimodel, and Naviscan workflows.
- Processed data with Naviedit, Microsoft Excel, and Sonardyne USBL for positioning.
- Collected sonar, magnetometer, and depth measurements using WGS+, Beacons, C-nav DGPS, and profilers.
- Attended international conferences related to hydrography staying updated about latest trends and technologies in the field.
- Processed raw survey data into usable formats for easy interpretation by non-expert stakeholders.
- Compiled extensive reports on survey findings, promoting transparency and facilitating informed decision-making.
Geophysicist / Data Processor
Ikong/Nkuru Nigeria
Mobil Filed
11.2023 - 11.2023
- Execute geophysical surveys and generate seabed bathymetry data using EIVA navigation tools.
- Operate Navipac, Naviscan, Naviedit, C-Nav, DGPS and sound velocity profiling.
- Capture side scan sonar, magnetometer, and sub-bottom profiles using ECHOTRAC and Edgetech systems.
- Worked closely with geologists in establishing accurate stratigraphic frameworks for exploratory purposes.
- Utilized advanced software tools to improve subsurface imaging quality by over 50%.
- Performed quantitative interpretation tasks for superior understanding of subsurface conditions.
- Ensured compliance with environmental regulations, supporting sustainable operations practices.
Geophysicist /Data Processor
Tenoil
Bonga, Nigeria
04.2022 - 04.2022
- Coordinated rig move and survey pre-engineering preparations for new sector work.
- Conducted sector scans and managed survey mobilization across geophysical tasks.
- Delivered underwater positioning using EIVA Navipac and Naviscan software for tracking.
- Configured Naviedit workflows to process data from USBL and DGPS.
- Profiled sound velocity using EdgeTech tools to support subsea survey accuracy.
- Operated C-NAV navigation and side scan sonar for underwater mapping outputs.
Data Processor / Report Coordinator
Chevron Nig. Ltd
Okan
08.2025 - 09.2025
- Coordinate geophysical and geotechnical surveys using EIVA Navipac and EIVA processing tools.
- Produce CAD drawings and survey layouts in AutoCAD alongside SonarWiz 8 reviews.
- Compile bathymetry and maps in ArcGIS and Geosoft Oasis Montaj workflows.
- Perform data analysis using Golden Software Surfer and Geosoft routines for interpretation.
- Generate surface, profile, and correction outputs in Veripos DGPS positioning checks.
- Support shipboard measurement planning using Microsoft Office for log entries.
- Provided training to junior staff members enhancing their performance.
Survey party chief
Chevron
Okan Field
06.2025 - 07.2025
- Run geophysical and geotechnical surveys using EIVA Navipac and EIVA tools.
- Configure AutoCAD and HYPACK workflows for field data capture and checks.
- Operate Microsoft Office for survey reporting, filing, and document control.
- Streamlined data processing for quicker project completion.
- Provided detailed reports with meticulous data interpretation.
- Designed comprehensive layouts using CAD software, enhancing visual representation of sites.
- Conducted extensive field surveys, improving project accuracy.
- Created detailed survey reports outlining possible issues and recommended solutions.
Online Surveyor / Data Processor
Chevron
Escravos Field, Nigeria
01.2025 - 02.2025
- Conduct pre-lay geotechnical surveys using EIVA Navipac and Navimodel software.
- Collect multibeam and imaging data with Naviscan, NaviEdit, and C-Nav systems.
- Process survey soundings using DGPS, sound velocity profiling, and tide gauge.
- Executed meticulous mapping activities for creating reliable base maps.
- Identified risks and proposed mitigation strategies through thorough assessment of sites.
Survey party chief
GHL/MPL/BSNL
OYO field, Nigeria
10.2024 - 11.2024
- Managed anchor systems at OYO Fpso Tt using site procedures daily.
- Verified EIVA Navipac datasets for navigation, hydrography, and survey consistency.
- Configured Veripos positioning workflows and checked Microsoft Office outputs.
- Detected fire hazards and outlined detailed to mitigate risk of fire.
- Provided detailed reports with meticulous data interpretation.
- Identified need for maintenance and repair work, scheduling as necessary.
Online Surveyor
CHEVRON/MPL
AGBAMI Field, Nigeria
07.2024 - 09.2024
- Conduct GVI and CVI pipeline surveys for cathodic protection risers.
- Inspect pipeline joints and riser locations for coating and corrosion issues.
- Verify survey records and export findings for pipeline protection reporting.
- Operated advanced surveying equipment with utmost precision.
- Performed detailed site inspections to ensure construction adhered to project plans.
- Compiled comprehensive survey reports for informing key decision-making processes.
Online Surveyor / Data Processor
CHEVRON/PSL
Chevron Field
05.2024 - 07.2024
- Flexible Pipe-lay, Construction Support, Dive Support Underwater/Subsea Positioning, Touchdown Monitoring.
- EIVA Navipac, NaviModel, NaviScan, NaviEdit, USBL, C-Nav DGPS, Sound Velocity Profiler, Edgetech Side Scan Sonar, Geo Acoustic Pulse Sub-bottom, EA400 Echo sounder, AutoCAD, SonarWiz, ArcGIS, Visual Soft, Mesotech Sector Scanner.
Geophysicist
Technixs/ Rangers. Shell Petroleum Development Company
Forcados Estuary
07.2019 - 08.2019
- Barge/Tug Management and Subsea Positioning/ Monitoring
- EIVA Navipac, C-Nav DGPS, Sound Velocity Profiler, Mesotech 1000, Microsoft Word, EchoTrac Echo sounder, Telemetry, Sonardyne USBL, WGS+, Applied Acoustic Beacons
Education
Master of Applied Geophysics - Geophysics
University of Lagos
Lagos, NigeriaBSc - Geology
Delta State University
Abraka, NigeriaSkills
- Eiva NaviSuite Pro
- SonarWiz
- AutoCAD
- Hypack
- ArcGIS
- Oasis Montaj
- Golden Surfer
- Gint Bentley
- Office Suite
- TSS440 Pipe Tracker
- USBL (Sonardyne Hipap IXblue GAPS)
- Side Scan Sonar
- Magnetometer
- Multi-beam Echosounder
- DGPS (Veripos Hemisphere C-NAV GNSS)
- Sector Scan Sonar
- Sub-bottom Profiler
- Total Station Equipment (Leica Sokkia Topcon etc)
- Statistical Analysis Expertise
- Communication Aptitude
- Data cleaning techniques
Certification
- Breathing Apparatus And H2S Safety Course, - Opito Certified
- Basic Offshore Safety Induction and Emergency Training (BOSIET), Opito Certified
- EIVA Certified Training Courses (NaviPac, NaviScan, NaviModel and NaviEdit)
Project Experiences
Pre-Engineering /Geotechnical Survey, Geophysical Survey, Construction Support, Pipe-lay, Post-lay/As-built Survey, Anchor Clearance Survey, Rig Move, Riser/Sleeper Installation, Sector Scan Survey, ROV Survey, Positioning of Vessel/Barge, SBM Change Out/Installation, Pipeline Inspection: Cathodic Protection and WROV Survey
Affiliations
- Sport
- Swimming
- Reading
References
References available upon request.
Timeline
Online Surveyor/ROV PT Trainee
Chevron
09.2025 - 11.2025
Data Processor / Report Coordinator
Chevron Nig. Ltd
08.2025 - 09.2025
Survey party chief
Chevron
06.2025 - 07.2025
Online Surveyor/ROV PT Trainee
Chevron
03.2025 - 07.2025
Online Surveyor / Data Processor
Chevron
01.2025 - 02.2025
Geophysicist
Aveon Offshore
12.2024 - 12.2024
Survey party chief
CNL/MPL/BSNL
11.2024 - 01.2025
Survey party chief
GHL/MPL/BSNL
10.2024 - 11.2024
Survey party chief
GHL/MPL/BSNL
10.2024 - 11.2024
Online Surveyor
CHEVRON/MPL
07.2024 - 09.2024
Online Surveyor
CHEVRON/MPL
05.2024 - 06.2024
Online Surveyor / Data Processor
CHEVRON/PSL
05.2024 - 07.2024
Hydrographic Surveyor / Data Processor
Ikong Energy
02.2024 - 03.2024
Geophysicist / Data Processor
Ikong/Nkuru Nigeria
11.2023 - 11.2023
Geophysicist /Data Processor
Tenoil
04.2022 - 04.2022
Geophysicist
Technixs/ Rangers. Shell Petroleum Development Company
07.2019 - 08.2019
BSc - Geology
Delta State University
Master of Applied Geophysics - Geophysics
University of Lagos