There is no such thing as an "AFISO" any more. The term is FISO because they may operate in information regions as well as at aerodromes.. .. .Red Four makes a curious comment: "A/G or FISO units are not required to record the frequency they operate on". .. .They are only allowed to operate on the frequency that has been allocated to them by the CAA.. .. .The major problem with A/G operators is that many are unqualified. In order to operate an A/G station you must be in posession of a Radio Operator's Certificate of Competence, to be valid the certificate must be signed by the radio station licensee, who is responsible for ensuring that the station is operated in accordance with CAP452. Many holders of this certificate obtained it on the basis of holding a FRTOL, it is probably unsigned, and they may never have seen a CAP452.