Acceptable Lateral Deviation
When it comes to flying a Federal airway in the US, a lateral deviation of greater than 4NM from the centerline of the airway is considered off course.
However, what is considered off-course when flying a course which is not an airway? For example, point-to-point, present-position direct to a point, etc.?
Also, what is considered off-course when flying over the ocean such as Atlantic or Pacific routes?
Thank you.