Green Guard:
1/4 NM OFF Track setting should be used EVERYWHERE...
Yes, good for oceanic and remote, non-radar land areas. But, most definately not good everywhere. In domestic, conjested airspace, if the equipment will support 1/10 of a mile offset, that would be far better for en route than 1/4.
Even for 1 NM you'll never get any remark from any ATC all the way down to APP.
I am not sure what you mean by "APP" in this context; initial approach segment? Intermediate segment up to the FAF? Offsets should not be used in any phase of an instrument approach procedure.
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 ??
Apples and oranges.