What might happen if a GPS unit loses RAIM?

When a GPS unit loses RAIM, or Receiver Autonomous Integrity Monitoring, it no longer has the ability to verify the integrity of its satellite signals. RAIM is used to ensure that the data received from the satellites is accurate and reliable. Without RAIM, the GPS unit may not be able to detect errors in the satellite signals it is using, leading to the possibility of inaccurate positioning.

In practical terms, if the GPS unit loses RAIM, it might still report a position, but that position could be incorrect due to faulty satellite data. This inaccuracy can pose significant risks, especially in critical navigation situations where precise location information is vital for safety and operational efficiency. Therefore, the correct answer highlights the potential for inaccurate positioning as a direct consequence of losing RAIM functionality.