OFF SET is not a 100% guarantie but
1/4 NM OFF Track setting should be used EVERYWHERE...
Even for 1 NM you'll never get any remark from any ATC all the way down to APP.
For those "robot" pilots who insist on absolutely on track all the time,
even perhaps Mr. 411,
1. I would ask them if they drive their cars over the middle of the two-lane opposite-direction road ??
2. What harm can be done by 1/4 NM Offset to anybody and anything ??