The Maritime Directive is defined by EN60945. This standard covers many of the generic tests, but adds specific EMC requirements for magnetic emissions and low frequency conducted emissions.
The VHF band has limits considerably lower than CISPR Class B.
Immunity requirements change with categories also.
Most EMC standards allow the limits to be met without including the measurement uncertainty, but EN60945 is unique in that the limits can only be met when the measured emission or immunity result is less than the limit including the uncertainty value.
We have installed a GPS re-radiating facility, enabling us to run AIS and other types of equipment correctly during testing without having to simulate signals.
We have 115V 50/60Hz, 230V 50/60Hz and 440V 50/60Hz as well as 24Volt DC to power all types of equipment.