An instruction from ATC is often a free pass to deviate from the FAR's.
I was allowed deviation from a FAR last week in my J-3 when I entered
the mode C veil of Seatack.

Many of the rules say "unless authorized by the administrator, no person
may..." and an instruction from ATC =is= such an authorization. So it's
within the rules.

Jose
--
The price of freedom is... well... freedom.
for Email, make the obvious change in the address.