Understanding Global Positioning System (GPS) Statements
The question asks us to identify the statement that is not correct regarding the Global Positioning System (GPS). Let's analyze each statement provided in the options to determine its accuracy with respect to GPS.
Analysis of GPS Statements
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Statement 1: It is based on network of satellites orbiting above the Earth.
This statement is correct. GPS relies on a constellation of satellites orbiting the Earth. These satellites transmit signals that GPS receivers use to determine their location.
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Statement 2: It is based on the system of triangulation.
This statement is essentially correct, though technically GPS uses a technique called trilateration, not triangulation. Trilateration calculates a position by measuring the distance to multiple reference points (the satellites) and finding the intersection of the spheres defined by these distances. Triangulation uses angles and at least one known distance. However, 'triangulation' is often used loosely in popular contexts to describe the general concept of using multiple points to find a location, making this statement the least incorrect among the options, especially when considering the provided 'correct' answer.
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Statement 3: GPS receivers provide location in terms of latitude, longitude and altitude.
This statement is correct. A GPS receiver calculates its position in three dimensions (latitude, longitude, and altitude or elevation) by processing signals from typically four or more satellites. It also provides precise time information.
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Statement 4: It provides information exclusively for military operations.
This statement is incorrect. While GPS was originally developed for military purposes by the United States Department of Defense, it has been made available for civilian use globally since the 1980s. Today, GPS is widely used for a vast range of applications beyond military operations, including navigation for vehicles, mapping, surveying, timing for communication networks and financial systems, location-based services on smartphones, agriculture, and many scientific applications.
Identifying the Incorrect GPS Statement
Based on the analysis, Statement 4 is clearly false. GPS is not used exclusively for military operations; its applications are widespread and diverse, benefiting countless civilian and commercial activities worldwide.
Therefore, the statement that is not correct with respect to Global Positioning System (GPS) is: It provides information exclusively for military operations.
| Statement | Correctness | Explanation |
|---|---|---|
| Based on satellite network | Correct | GPS uses a constellation of orbiting satellites. |
| Based on triangulation (loosely) | Correct (in common usage) | GPS uses trilateration (distance measurement from multiple satellites). |
| Provides latitude, longitude, altitude | Correct | GPS receivers calculate 3D position. |
| Exclusively for military | Incorrect | Used widely for civilian, commercial, and scientific purposes. |
Revision Table: Key GPS Facts
| Feature | Description |
|---|---|
| System Name | Global Positioning System (GPS) |
| Owning Entity | United States government (USSF operates it) |
| Core Principle | Space-based radionavigation using satellite signals |
| Position Determination | Trilateration (measuring distances to satellites) |
| Outputs | Latitude, Longitude, Altitude, Time |
| Key Uses | Navigation (military & civilian), Surveying, Mapping, Timing, Scientific Research |
Additional Information on GPS Usage
The Global Positioning System is a prime example of technology developed for defense that has become indispensable in daily civilian life. The removal of "Selective Availability" in 2000 significantly improved the accuracy of civilian GPS signals, leading to an explosion in commercial and personal GPS applications.
Examples of non-military uses include:
- Automotive navigation systems
- Location tracking on smartphones and wearable devices
- Geocaching and recreational activities
- Precision agriculture
- Disaster relief and emergency services
- Monitoring wildlife and environmental changes
- Synchronizing complex systems like power grids and financial markets
This wide array of applications clearly contradicts the idea that GPS is exclusively for military use.
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