In the world of land and marine surveying, accuracy is everything. Whether you’re mapping coastal terrain, building infrastructure, or conducting scientific research, the quality of your data determines the quality of your decisions.
That’s where GNSS — Global Navigation Satellite System — comes in.
Often confused with GPS, GNSS is the backbone of modern geospatial work. At OSEANA, we rely on GNSS technology daily to support clients across industries like construction, oil and gas, government planning, and marine navigation. If you’re not entirely clear on what GNSS is or why it matters, this article is for you.
GNSS vs GPS: What’s the Difference?
Let’s clear up the confusion:
1. GPS (Global Positioning System) is just one satellite system, operated by the United States.
2. GNSS is the broader category — it includes GPS and other systems like: GLONASS (Russia), Galileo (European Union), BeiDou (China).
GNSS receivers can access multiple satellite constellations at once, offering faster positioning, higher accuracy, and better reliability, especially in areas with obstructions (e.g., urban zones or under canopy).
Why GNSS Is Essential in Surveying
In professional surveying, the difference between a few centimeters can change everything. GNSS makes that precision possible, thanks to its:
1. Multi-satellite access → Improves signal stability and coverage
2. Real-time corrections (RTK, PPP, or satellite services like MarineStar) → Reduces errors to sub-centimeter level
3. Versatile usage → Works on land, at sea, and in the air (drones)
Whether it’s for land parcel mapping, infrastructure alignment, or marine positioning, GNSS is the standard in modern geospatial workflows.
Common GNSS Use Cases in the Field
How GNSS Works with Correction Services
Raw GNSS data has a natural error margin of several meters — but that’s where correction services come in.
Some methods include:
1. RTK (Real-Time Kinematic) – Requires a base station; great for short-range precision
2. PPK (Post-Processed Kinematic) – Used when real-time corrections aren't available
3. Satellite-Based Corrections (e.g., MarineStar) – Ideal for offshore or mobile projects without ground infrastructure
OSEANA supports GNSS solutions with these correction options built-in or available through our service packages — ensuring accuracy no matter where your project takes place.
Our Recommended GNSS Tools
We supply and rent high-quality GNSS units, including:
Whether you're mapping a mine site or running a bathymetric survey at sea, we’ll match the tool to the task.
GNSS is more than just positioning — it's the foundation of modern surveying. Its precision, flexibility, and compatibility with other systems make it indispensable for serious geospatial work.
If your team needs help choosing the right GNSS solution or implementing correction services in the field, OSEANA can support you — with the tools, expertise, and reliability to get your project right from the first coordinate.