47 C.F.R. § 80.971 Test of radiotelephone installation.
Title 47 - Telecommunication
At least once during each calendar day a vessel subject to the Great Lakes Radio Agreement must test communications on 156.800 MHz to demonstrate that the radiotelephone installation is in proper operating condition unless the normal daily use of the equipment demonstrates that this installation is in proper operating condition. If equipment is not in operating condition, the master must have it restored to effective operation as soon as possible.
Title 47: Telecommunication
PART 80—STATIONS IN THE MARITIME SERVICES
Subpart T—Radiotelephone Installation Required for Vessels on the Great Lakes
§ 80.971 Test of radiotelephone installation.
