The European Union has introduced the 15th sanctions package, in its continued effort to address sanctions circumvention and undermine Russia’s military and industrial capabilities. It targets 52 additional ships involved in high-risk activities, including transporting oil, arms, and stolen Ukrainian grain. Escalating Measures Against Russia’s Shadow Fleet The EU’s focus in this sanctions package is...
Windward customers keep winning! A Spanish operation in the Atlantic led to the seizure of 4 tons of cocaine, according to a LinkedIn post from the Maritime Analysis and Operations Centre – Narcotics (MAOC-N). Shared Intel & Operational Plan Lead to Huge Drug Bust The MAOC-N is an initiative by nine EU Member Countries (France,...
A Global Navigation Satellite System, or GNSS, is a network of satellites that broadcasts timing and orbital information, which is used for navigation and measuring the position of an item. In Windward’s context, GNSS is used to determine the location of a vessel.
GNSS measures three things. The location of an item, the speed of an item, and timing. With the right technology in place, it is extremely accurate.
Location – accurate within millimeters
Speed – User range rate error (URRE) of ≤0.006 m/sec over any 3-second period
Timing – ≤30 nanoseconds (billionths of a second)
How Does GNSS work?
Three elements comprise GNSS systems. The space segment refers to the network of satellites, called constellations, that orbit 20,000 kilometers above the earth. Each satellite in the GNSS constellation sends out a signal that identifies it and shares its time, orbit, and status.
The second element of GNSS is the control segment, powered by an earth-based network of ground control stations that function as GNSS receivers. The ground control stations analyze the signals they receive and transmit orbit and time corrections to the satellites in the constellation through data uploading stations.
The third element of GNSS is the user segment. This refers to the device, such as a smartphone or receiver, that is implanted on the vessel being tracked.
What is the Difference between GNSS & GPS?
People are often confused between GNSS vs. GPS, as both appear to be global tracking systems that can identify an object’s location.
GNSS is a broad term for a satellite navigation system that identifies the position, navigation, and timing used in different applications. GPS is the name of the North American GNSS system.
Difference between GNSS and GPS:
GNSS (Global Navigation Satellite System) is a comprehensive term that includes all satellite-based navigation systems providing global positioning and timing data. This encompasses multiple systems like GPS (USA), GLONASS (Russia), Galileo (EU), BeiDou (China), and others. As of 2024, over 120 operational GNSS satellites are orbiting the Earth, contributing to enhanced global coverage and accuracy. The trend is toward multi-GNSS receivers, which use signals from multiple systems to improve positioning accuracy, especially in challenging environments like urban canyons.
GPS (Global Positioning System), developed and operated by the United States, is one of the most widely recognized GNSS systems. It consists of around 31 operational satellites, providing near-global coverage. Recent upgrades include the launch of GPS Block III satellites, which offer improved signal strength and accuracy, as well as enhanced resistance to jamming and spoofing. Despite being a single system within the GNSS framework, GPS remains the backbone of many positioning applications.
What is Location (GNSS) Manipulation?
According to Global Trade Review, “illicit actors are turning to new techniques to evade sanctions on maritime trade, with industry insiders warning of a spike in location signal manipulation and “deep” dark activity.”
Location (GNSS) manipulation involves the deliberate falsification of a vessel’s geographical data, often employing machine-generated locations or paths to mask the actual location. This deceptive practice can be executed through various methods, such as installing devices onboard that transmit false information, or coordinating with third-party accomplices located onshore. The implications of such manipulations are significant, making it imperative for stakeholders to thoroughly “know your vessel.” Understanding the specific risks and exposures associated with location (GNSS) manipulation is critical in safeguarding maritime operations and ensuring the safety and security of shipping activities. Such awareness and vigilance help in maintaining compliance with international maritime regulations, especially in these volatile times.
How are GNSS Systems Measured?
There are four criteria used when measuring GNSS data to determine the performance of the system.
Accuracy – the difference between the GNSS receiver’s measured position, speed, and time, and the object’s actual position, speed, and time.
Availability – the percentage of time the GNSS is available.
Continuity – the system’s ability to perform its required function throughout an operation, without interruption.
Integrity – the measure of trust users can place in the GNSS data. This includes the system’s ability to warn users when the system is not functioning correctly.
What are Factors that Impact GNSS Accuracy?
GNSS is a highly accurate positioning system. Depending on the quality of the device and other environmental factors, GNSS can locate an item within a few centimeters. The highest accuracy occurs with dual-frequency GNSS receivers or augmentation systems beneath an open sky. A typical smartphone, in contrast, offers accuracy within a 5-meter radius.
Factors that reduce GNSS accuracy:
Signal blockage due to buildings, bridges, and trees
Underground, or indoor use
Signal reflected off the sides of buildings
Major solar storms
Satellite maintenance
Additionally, sometimes GNSS measurements are accurate, but incorrectly drawn maps, missing roads, mislabeled businesses, or mistakenly labeled street addresses make them seem incorrect.
What are the Different GNSS Systems Being Used?
Currently, there are four main GNSS constellations and two regional ones in use.
Global Positioning System (GPS), United States – the first GNSS system in the world, GPS initiated operations in 1978 and has been available for global use since 1994. GPS has 31 satellites in its constellation that are in orbit and operational. It is maintained by the United States Air Force.
Global Navigation Satellite System (GLONASS), Russia – Russia’s GNSS constellation began flight tests in 1982 and went operational in 1993, with 12 satellites in two orbits. Today, there are 26 satellites in the GLONASS constellation, which is operated by the Russian Aerospace Defence Forces.
Galileo, European Union – the European Union’s Galileo system was developed by the European Space Agency and is currently operated by the European Space Agency (ESA) for the Space Programme (EUSPA). Galileo went operational in 2016 and currently has 24 active satellites and two base stations.
BeiDou Navigation Satellite System (BDS), China – BeiDou first went operational as a regional system with limited coverage in 2000. Since then, it has expanded its operations and has provided global coverage since 2018. China has reportedly launched 55 satellites as part of different BDS constellations, of which 35 are believed to still be operational.
Indian Regional Navigation Satellite System (IRNSS), India – tThe IRNSS constellation first began orbiting in 2018. There are currently seven satellites in the constellation. Its coverage area includes India and 1,500 km around the country. NavIC, the operational arm of the IRNSS, offers a standard level of service for civilian use and an encrypted service for authorized users.
Quasi-Zenith Satellite System (QZSS), Japan – the QZSS is a regional GNSS covering Asia-Oceanic regions. The system has four satellites in its constellation and has been operational since November 2018.
GNSS Applications
There are a number of GNSS applications used in military, commercial, and private settings. These include navigation systems, tracking, scientific research, telecommunications, emergency response, and more. GNSS is even used by dog owners to ensure that pets don’t get lost.
Interesting GNSS Facts
Selective Availability
In 1983, U.S. President Ronald Reagan told civilians they could use the service. However, in an effort to secure a military advantage for the United States, he limited its accuracy with a feature called “Selective Availability.”
Selective Availability was an intentional degradation of GPS. Rather than providing accurate locations, civilian GPS was accurate within 50 meters.
With the advent of new technologies, Bill Clinton eliminated the use of Selective Availability in May 2000. Today, GPS is accurate for civilian use.
Development of the IRNSS
India decided to develop its own regional service in 1999 after the United States denied its request to use its GPS for military use in the Kargil region.
What is the SHIP Act? The Stop Harboring Iranian Petroleum Act (SHIP Act) was enacted as part of the Emergency Supplemental Appropriations for the 2024 Fiscal Year. It aims to impose sanctions on foreign individuals and entities involved in the trade of petroleum and petroleum products originating in Iran. It specifically targets the shadow fleet...
What is Data Fusion? Data fusion is the process of integrating data from multiple sources to create a unified, accurate, and comprehensive view. In the maritime industry, where data can often be noisy or fragmented, fusion eliminates inconsistencies and enables advanced AI models to deliver full visibility and actionable insights. Without data fusion, organizations face...
What is Commodity Trading? Commodity trading is the buying, selling, and exchanging of raw materials or primary goods. These goods are typically classified into two categories: hard commodities (like metals and energy resources) and soft commodities (such as agricultural products). Traders engage in this activity to profit from price fluctuations, hedge risks, or fulfill supply...
What is a Security Team in the Maritime Industry? A security team in the maritime industry is a specialized group tasked with ensuring the safety and security of vessels, crews, and cargo in maritime environments. They work for a variety of organizations and are essential in the planning and execution of commercial shipments that traverse...
What is Risk Mitigation? Risk mitigation refers to the process of identifying, assessing, and prioritizing risks, followed by the application of resources to minimize, control, or eliminate the impact of those risks on an organization. The goal of risk mitigation is to reduce the probability of a risk event occurring and to minimize negative consequences...
