However, amplitude modulation (AM) and some variants such as vestigial sideband are still in use, mainly by vessels with older equipment and by some coastal stations in an attempt to ensure compatibility with older and less sophisticated receivers.
Despite being used, amplitude modulation (AM) and some of its variations such as vestigial sideband continue to be employed, especially by vessels with obsolete equipment and certain coastal stations aiming for compatibility with older, less sophisticated receivers.