What does not contribute to the commercial...

What does not contribute to the commercial GPS receiver position error?

🔍 Key Concepts

• Sources of GPS error such as satellite clock, ephemeris (orbit) error, and signal delay in the ionosphere/troposphere • The difference between external conditions affecting the signal and the receiver’s own motion or setup • How a GPS receiver calculates position using time-of-flight of signals from multiple satellites

💭 Think About

• Ask yourself which options are known standard error sources in GPS textbooks and manuals, especially for civil/commercial GPS • Consider whether the ship’s own motion directly distorts the satellite signal itself, or if it is simply handled by the receiver’s tracking algorithms • Think about which factors are controlled by the satellite system and the space environment, versus what belongs to the user platform

✅ Before You Answer

• Verify which factors are explicitly listed as GPS error sources: satellite clock, satellite orbit (ephemeris), and ionospheric/tropospheric delay • Check whether receiver or platform motion is normally classified as a GPS error source or simply a condition the receiver is designed to track • Confirm that the option you choose is the one that does not change the accuracy of the position fix itself, but may just change how often or how quickly it is updated

🔍 Key Concepts

💭 Think About

✅ Before You Answer