What is the maximum number of minutes apart that navigation checkpoints should not exceed?

The correct choice indicates that navigation checkpoints should not exceed 25 minutes apart. This standard is rooted in ensuring that pilots maintain situational awareness and effectively monitor their flight path and performance. By keeping navigation checkpoints within this timeframe, pilots are encouraged to regularly confirm their positions relative to their intended route, making necessary adjustments as required.

In practice, limiting the interval between checkpoints helps enhance safety by avoiding situations where pilots may become disoriented or lose track of time during the flight. These checkpoints serve as critical reference points for assessing the aircraft's progress and confirming adherence to the planned route.

The choice of 25 minutes strikes a balance between allowing sufficient time for navigation without becoming too infrequent, ensuring effective monitoring throughout the flight. This practice contributes to overall flight safety and efficiency.