What is the first leg direction of drift if it is stated to be 90 degrees to the right?

When the drift is stated to be 90 degrees to the right, it means that you will be altering your course by turning directly to the right from your current heading. In navigating terminology, a direction of "straight right” means maintaining that 90-degree turn directly, which aligns with the drift's specifications.

In the context of navigation, think of your current heading as a reference point: if you are facing straight ahead and turn 90 degrees to the right, you will be heading directly to your right. This is why the most appropriate response to the question would be to indicate that the first leg direction of drift is indeed straight right.

Other options do not correctly capture the instruction of turning 90 degrees to the right from the current heading. For example, turning 90 degrees to the left would lead to a different course, and similarly, any other directional shifts would not reflect a straight movement to the right. Thus, identifying "straight right" as the direction clearly conveys the intended navigation adjustment based on the given drift.