Those two sections are my bible. I can guarantee you that there is no such
prohibition. HOWEVER, the misinterpretation of the part that prohibits
SIMULTANEOUS AM and FM modulation may be causing the confusion. So long as
it is AM on the aircraft band and FM on the marine band, there is no
prohibition.

Jim



A read through the FCC aviation and marine regs would confirm or deny
if there is any regulatory restriction to such a dual radio.