The ITU World Radio Communication Conferences in 2012, 2015 and 2019 made extensive changes to appendix 18 of the Radio Regulation (RR). While these changes do not affect the Global Maritime Distress and Safety System (GMDSS), they do affect the use of other frequencies used for VHF meteorological, navigational and urgent Marine information broadcasts, port operations and Vessel Traffic Service (VTS), reports Witherbys.
According to the Performance standards for...
https://mfame.guru/guidance-on-validity-of-radio-communication-equipment-on-ships/