Freelance Geophysicist

GAJ Geophysical
Services

Godwin Offisong Unoh · CEO

Over 13 years of hands-on expertise in marine and land geophysical field acquisition and data processing — delivering precision, insight, and industry-grade results across Nigeria, Africa, and international markets. Available on-site or fully remote.

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13+
Years Experience
11+
Industry Softwares
100%
Precision Focus
About

Precision Where
It Matters Most

I am Godwin Offisong Unoh, CEO of GAJ Geophysical Services and a seasoned geophysicist with over 13 years of field and processing experience across marine and terrestrial survey environments.

GAJ Geophysical Services provides end-to-end geophysical solutions — from raw field acquisition to polished, client-ready deliverables — across Nigeria, Africa, and globally. We are available for both on-site deployments and fully remote data processing engagements for international clients.

Whether you need a reliable professional for offshore multibeam surveys, sub-bottom profiling, side-scan sonar operations, or complete remote data processing workflows anywhere in Nigeria, across Africa, or internationally, we bring the technical depth and field-hardened experience your project demands.

We also work with industry-standard CAD and GIS software for precision charting, spatial analysis, and professional geophysical reporting — ensuring every deliverable meets client and regulatory standards.

GAJ Geophysical Services is based in Rivers State, Nigeria, with our head office in Port Harcourt — serving clients locally across the Niger Delta and internationally on a remote or mobilisation basis.

Field Acquisition
Marine & land surveys · Multibeam · Side-scan sonar · Sub-bottom profiling · USBL navigation
Data Processing
Bathymetric processing · Sonar mosaicking · Point cloud QC · Final deliverable preparation
Consulting & Reporting
Technical interpretation · Survey planning · QA/QC · Client-ready geophysical reports
Godwin Offisong Unoh – CEO, GAJ Geophysical Services
Godwin Offisong Unoh
CEO · GAJ Geophysical Services
LinkedIn Profile
Industry Software Proficiency
SonarWiz Processing
Qimera Bathymetry
BeamworX Processing
EIVA NaviSuite Navigation
EIVA NaviModel 3D Model
EIVA NaviEdit QC / Edit
EIVA NaviScan Scanning
HYPACK Acquisition
CARIS HIPS/SIPS Hydrographic
Kingdom Suite / Petrel Seismic
AutoCAD / MicroStation CAD
ArcGIS / QGIS GIS
Services

What I Deliver

Comprehensive geophysical solutions — from mobilisation to final report — tailored to your project's scope and timeline.

01
〰
Marine Field Acquisition

Full offshore survey operations including multibeam echosounder, side-scan sonar, sub-bottom profiler, and USBL/LBL acoustic positioning.

MBES SSS SBP USBL
02
⬡
Bathymetric Data Processing

End-to-end processing of multibeam data — from raw ping editing, SVP application, and tidal correction to final cleaned point cloud and DTM generation.

Qimera CARIS BeamworX
03
◈
Side-Scan Sonar Processing

Sonar imagery processing, bottom tracking correction, mosaicking, and target detection analysis for UXO, pipeline, cable, and seabed feature surveys.

SonarWiz Mosaic Target ID
04
≋
Sub-Bottom Profiling

Shallow seismic stratigraphy interpretation, horizon picking, sediment thickness mapping, and deliverable production for geotechnical and infrastructure projects.

Sediment Stratigraphy SBP
05
◎
Navigation & Positioning

Survey navigation setup, vessel heading/motion compensation, GNSS integration, and real-time QC using EIVA NaviSuite and HYPACK.

EIVA HYPACK GNSS
06
▦
Reporting & Consulting

Technical geophysical report writing, survey design, QA/QC management, and expert consultancy for oil & gas, renewables, and marine infrastructure sectors.

Reports QA/QC Planning
Project Types

Types of Work We Do

From offshore Nigeria to remote international projects — we support a wide range of geophysical survey and data processing engagements across Africa and beyond.

🌊
Offshore Geophysical Survey

Survey support for oil & gas, offshore energy, and marine construction projects across African waters and international offshore zones.

01
🗺️
Pipeline & Cable Route Survey

Survey data processing and interpretation for route planning, seabed assessment, freespan detection, and as-built pipeline surveys.

02
⚓
Dredging & Volume Survey

Bathymetry processing, seabed mapping, and survey deliverables for port dredging, volume calculations, and harbour development support.

03
🌍
Environmental & Coastal Studies

Geophysical and hydrographic support for coastal zone management, environmental impact assessments, and development projects across Africa.

04
💨
Renewables & Wind Farm Site Survey

Seabed characterisation, shallow hazard assessment, and geotechnical support for offshore wind, solar, and renewable energy projects.

05
🛰️
Remote Data Processing

Full remote processing service for international clients — raw data received digitally, processed deliverables (DTM, GIS, CAD charts, reports) returned online.

06
Geographic Reach
Nigeria · West Africa · Pan-Africa · International
🇳🇬 Nigeria (All States) 🌍 West Africa 🌐 Pan-Africa ✈️ International On-site 💻 Remote Worldwide
Software Expertise

Tools of the Trade

Proficient in the full suite of industry-standard geophysical acquisition and processing platforms.

📡
SonarWiz
SSS / SBP Processing
🌊
Qimera
MBES Processing
⚙️
BeamworX
Beam Processing
🧭
EIVA NaviSuite
Navigation / Acquisition
🖥️
EIVA NaviModel
3D Modelling & Visualisation
✏️
EIVA NaviEdit
Data Editing & QC
📶
EIVA NaviScan
Scanning & Survey Control
🗺️
HYPACK
Survey Navigation
💎
CARIS HIPS/SIPS
Hydrographic Suite
🪨
Kingdom Suite
Seismic Interpretation
🛢️
Petrel
Subsurface Modelling
📐
AutoCAD / MicroStation
CAD · Charting & Drafting
🗾
ArcGIS / QGIS
GIS · Spatial Analysis
Recent Work

Project Portfolio

A selection of real deliverables and field outputs from recent geophysical survey and data processing projects.

3D Pipeline Scan – Multibeam / NaviModel
3D Pipeline Seabed Scan
Multibeam · EIVA NaviModel
High-resolution 3D point cloud of a subsea pipeline showing freespan and burial status along the route.
MBES
Bathymetric DTM – Multibeam
Multibeam Bathymetric DTM
Qimera · CARIS
Colour-coded depth model revealing seabed morphology, slope features, and pockmark structures.
Bathymetry
Side-Scan Sonar Mosaic
Side-Scan Sonar Mosaic
SonarWiz · SSS Processing
Processed SSS mosaic showing seabed texture, backscatter variation, and feature detection across survey area.
SSS
Seismic Acquisition – GeoRecorder Live
Live Seismic Acquisition
GeoRecorder · Field Operations
Real-time shot gather and trace monitoring during active marine seismic survey operations.
Seismic
High-resolution Backscatter / Lidar Survey
High-Res Backscatter Mosaic
Sonar · Backscatter Processing
Full-coverage backscatter mosaic with pipeline route overlay for infrastructure corridor surveys.
Backscatter
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Company Profile

Who We Are

Godwin Offisong Unoh
CEO & Founder
Godwin Offisong Unoh
Chief Executive Officer · GAJ Geophysical Services

Godwin Offisong Unoh is a highly experienced geophysicist with over 13 years of hands-on expertise in marine and land geophysical survey operations. He founded GAJ Geophysical Services to deliver world-class geophysical solutions from the heart of Nigeria's oil and gas capital, Port Harcourt.

His expertise spans the full survey lifecycle — from vessel mobilisation and sensor deployment through to final processed deliverables — with demonstrated proficiency across more than 11 industry-standard software platforms including the complete EIVA NaviSuite suite, SonarWiz, Qimera, BeamworX, HYPACK, CARIS, Kingdom Suite, Petrel, AutoCAD, ArcGIS, and QGIS.

A commitment to precision, client satisfaction, and technical excellence underpins every project undertaken by GAJ Geophysical Services — whether on-site in the Niger Delta or delivered remotely for international clients.

Connect on LinkedIn
13+
Years in Industry
11+
Software Platforms
2
Survey Disciplines
PH
Port Harcourt HQ
🌍
Global Remote Reach
Mission
Precision-Driven Geoscience

To deliver technically rigorous, cost-effective geophysical survey and data processing services that empower our clients to make confident, data-driven decisions about their subsurface and marine environments.

Vision
Africa's Premier Geophysical Partner

To be the most trusted freelance geophysical services provider in West Africa and beyond — bridging field expertise and digital processing capability for oil & gas, renewables, and infrastructure clients worldwide.

Core Values
What Guides Every Project
— Technical Precision
— Client-First Delivery
— Industry Standards Compliance
— Integrity & Transparency
— Continuous Innovation
Sectors Served
Oil & Gas Exploration Offshore Infrastructure Renewables & Wind Farm Marine Geotechnical Pipeline Route Surveys Port & Harbour Surveys Cable Route Surveys Environmental Monitoring UXO & Unexploded Ordnance Hydrographic Charting
Contact

Start a Project

Available for on-site deployments across Nigeria and Africa, and fully remote engagements for international clients worldwide. Reach out to discuss your survey needs, timelines, and deliverables.

✉
Primary Email
info@gajsolutions.com
✉
Personal Email
godwinunoh8@gmail.com
☏
Mobile / WhatsApp
+234 703 898 1930
◎
Availability
Nigeria · Africa · International Remote · Available globally
📍
Head Office
Port Harcourt, Rivers State, Nigeria
🌐