At five NM, I believe you are considered off the airway, well and truly.
What is the navigation error after a pacific crossing?
The whole premise is to advise those around you using TIBA procedures that you are 'off the airway', I m not advocating offsetting then reporting on the airway.
As I said, international SLOP does not cater for anything like five NM offsets.
Not even for weather avoidance?
If the company SOP's prohibit flight through TIBA then the correct action is to not fly through TIBA, however if you are permitted, there are a number of options available to complete the flight safely! This is evidenced by the number of aircraft in Australia that are now doing this routinely on a daily basis, of course this is not ideal, but that is a whole other thread going on elsewhere in D&G!
