What is the minimum degrees of course divergence required for simultaneous departures from parallel runways in a nonradar environment?

In a nonradar environment, to ensure safety during simultaneous departures from parallel runways, the minimum degrees of course divergence required is 45 degrees. This requirement is crucial because a divergence of 45 degrees helps to maintain adequate separation between aircraft immediately after takeoff. The greater the angle of divergence, the lower the chances of aircraft coming into conflict due to the limited situational awareness in a nonradar setting.

With a prescribed divergence of 45 degrees, air traffic controllers can effectively manage the lateral separation of departing aircraft, thereby reducing the risk of collision and enhancing overall operational safety. In situations where only a minimal amount of course divergence is maintained (such as below this threshold), the potential for encountering intrusions into another aircraft's flight path increases, which can compromise safety. Hence, specifying this 45-degree requirement mitigates those risks in an environment where radar assistance isn't available to track the aircraft movements closely.