47 CFR §95.1733

1. (a)In addition to the prohibited uses outlined in § 95.333 of this chapter, GMRS stations must not communicate:
   1. (1)Messages in connection with any activity which is against Federal, State, or local law;
   2. (2)False or deceptive messages;
   3. (3)Coded messages or messages with hidden meanings (“10 codes” are permissible);
   4. (4)Music, whistling, sound effects or material to amuse or entertain;
   5. (5)Advertisements or offers for the sale of goods or services;
   6. (6)Advertisements for a political candidate or political campaign (messages about the campaign business may be communicated);
   7. (7)International distress signals, such as the word “Mayday” (except when on a ship, aircraft or other vehicle in immediate danger to ask for help);
   8. (8)Messages which are both conveyed by a wireline control link and transmitted by a GMRS station;
   9. (9)Messages (except emergency messages) to any station in the Amateur Radio Service, to any unauthorized station, or to any foreign station;
   10. (10)Continuous or uninterrupted transmissions, except for communications involving the immediate safety of life or property; and
   11. (11)Messages for public address systems.
   12. (12)The provision of § 95.333 apply, however, if the licensee is a corporation and the license so indicates, it may use its GMRS system to furnish non-profit radio communication service to its parent corporation, to another subsidiary of the same parent, or to its own subsidiary.
2. (b)GMRS stations must not be used for one-way communications other than those listed in § 95.1731(b). Initial transmissions to establish two-way communications and data transmissions listed in § 95.1731(d) are not considered to be one-way communications for the purposes of this section.