What is EGI in Aviation? (Embedded Gps Inertial)

Embedded GPS Inertial (EGI) is a cutting-edge technology that plays a crucial role in aviation. It combines two essential systems, the Global Positioning System (GPS) and the Inertial Navigation System (INS), to provide accurate and reliable navigation and position information for aircraft. EGI allows pilots to determine their exact position, velocity, and attitude, even in areas where GPS signals may be compromised or unavailable. This article will explore the details of Embedded GPS Inertial and its significance in aviation.

Embedded GPS Inertial in Aviation

In aviation, accurate and timely navigation information is vital for the safety and efficiency of flights. Traditional navigation systems solely relied on inertial sensors, such as accelerometers and gyroscopes, to determine an aircraft’s position, attitude, and velocity. While these systems were reasonably accurate, they had limitations, particularly in terms of long-term accuracy due to drift. To mitigate these limitations, the introduction of GPS into the aviation industry revolutionized navigation.

GPS provides highly accurate positioning information by utilizing a network of satellites orbiting the Earth. By receiving signals from multiple satellites simultaneously, a GPS receiver can triangulate its exact location with exceptional precision. However, GPS has its own limitations as well. Signals can be weakened or disrupted by atmospheric conditions, buildings, or other geographical features, resulting in decreased accuracy or temporary loss of signal. To overcome these challenges, the integration of GPS with an Inertial NavigationSystem led to the development of Embedded GPS Inertial technology.

Advantages of Embedded GPS Inertial

EGI offers several advantages over traditional navigation systems, making it a preferred choice for modern aviation. Let’s delve into some of its key benefits:

1. Enhanced Accuracy: By combining the precise positioning capabilities of GPS with the continuously updated velocity and attitude data from the Inertial Navigation System, EGI provides extremely accurate navigation information. Pilots can rely on this information to ensure their aircraft’s position is always on track, enabling efficient routing and reducing the risk of navigation errors.

2. Reliability in GPS-Denied Environments: In some situations, like flying in mountainous regions or during military operations, GPS signals may be compromised or completely unavailable. EGI overcomes these challenges by integrating inertial sensors that can provide navigation data independently for short durations. This ensures that the aircraft remains aware of its position even when GPS signals are degraded or blocked.

3. Continuous Navigation Solution: Unlike traditional INS, which may suffer from drift over time, EGI constantly corrects and updates its position using GPS signals. This continuous correction ensures a highly accurate and reliable navigation solution for the entire duration of a flight. Pilots can trust the EGI to provide precise positioning information from takeoff to landing.

These advantages make Embedded GPS Inertial an indispensable technology for aviation, providing pilots with the tools they need to navigate safely and efficiently. Its integration into avionics systems has significantly improved the reliability and accuracy of aircraft navigation, bringing numerous benefits to the industry.

Implementation of Embedded GPS Inertial

The implementation and use of Embedded GPS Inertial systems vary across different aircraft and applications. However, the general process involves the following components:

1. GPS Receiver: A GPS receiver acts as the primary source of positioning information. It receives signals from multiple GPS satellites and calculates the aircraft’s position based on the time it takes for the signals to reach the receiver. The receiver also factors in the orbits and positions of the satellites in its calculations.

2. Inertial Navigation System: The Inertial Navigation System consists of accelerometers and gyroscopes that provide information about the aircraft’s acceleration and rotation rates. This data is used to determine the velocity, attitude, and position of the aircraft. In traditional INS, drift would occur over time, reducing accuracy. However, in EGI, the GPS signals correct and update the information provided by the INS, minimizing drift and improving accuracy.

3. Integration and Data Fusion: The GPS receiver and Inertial Navigation System are integrated into a single unit, combining their functionalities and sharing data between them. This integration ensures that accurate and up-to-date navigation information is constantly available to the pilot.

It’s important to note that the specific implementation of EGI may vary depending on the aircraft’s type, size, and intended use. The avionics system manufacturers customize the EGI integration to optimize performance and address the unique requirements of different aircraft models.


Embedded GPS Inertial (EGI) technology has revolutionized aviation navigation by combining the accuracy of GPS with the reliability of Inertial Navigation Systems. EGI provides enhanced accuracy, offers reliability in GPS-denied environments, and ensures a continuous navigation solution for pilots. Its implementation involves the integration of a GPS receiver and an Inertial Navigation System, along with data fusion to provide constant and accurate navigation information. As a result, EGI has become an indispensable tool for pilots, improving safety, efficiency, and overall navigation capabilities in the aviation industry.

For More: What is ATD in Aviation? (Actual Time Of Departure)