It is possible to deselect individual satellites by entering the satellite ID on the FMS GPS Control Page.

• A. True
• B. False
• C. Only if GPS is malfunctioning
• D. It affects all satellites

Answer: (A)

You can fine-tune the satellites that your GPS solution uses. On the FMS GPS Control Page, you have the ability to deselect individual satellites by entering their PRN (satellite ID). This lets you exclude satellites you suspect have poor quality or anomalous readings, which can help improve the accuracy of the position solution when others are healthy. When you deselect a satellite, the system recalculates using the remaining active satellites, as long as there are enough of them (at least four for a full 3D fix). It’s not limited to malfunction scenarios, and it won’t deselect all satellites automatically—only the ones you target.