CATEGORY A EPIRB’s transmit on frequencies that are monitored by（）. A: orbiting satellites in space B: commercial radio stations C: private，commercial，and military aircraft D: ordinary radio statio

Most modern Loran-C receivers，when not tracking properly，have a（n）（）. A: Bell alarm to warn the user B: Lighted alarm signal to warn the user C: Alternate signal keying system D: View finder for each statio