I guess, if one were planning a trip to a Country that has different Tx Power or WiFi channels Laws, then I guess we wouldn't get in any really big problems...
@John hill, I think you have WiFi channel "13" available to you "Austraila, here in the USA, that's a No, go.
As to TXpower, If one had a HAM Radio operator licence"Easily obtainable" then to "test" Txpower over WiFi isn't too much of a problem. "up to 500 watts"
"Testing" is the key.
Looking forward to
@BobNoxious using testing equipment. Willing to help with this subject.