What do you need to ensure while switching modes on the PRC 149?

Switching modes on the PRC 149 requires careful attention to the device's operational functionality, particularly concerning the GPS position. When changing modes, it is essential to avoid inadvertently changing settings that could lead to transmission issues. By not turning past the GPS position unless you intend to transmit, you are ensuring that the device remains in the correct operational state and minimizing the risk of unintended transmissions. This is critical for maintaining communication reliability and the overall effectiveness of the radio during operations.

The other options, while they may contain elements of good practice, do not directly address the specific operational detail pertaining to mode switching and its implications on GPS functionality and transmission integrity.