I think. Ships are strong for massive blackouted with Natural disaster situation.
It does not depend on external electric power, and unlike aircraft ATC also unnecessary, so not worry about a power outage on lands, It is possible to voyage for a long time. Moreover, even if the lighthouse stop by comptely blackout, it can Navigation with GNSS(GPS) in Now era. also can use the celestial-navigation in Clear weather situation if GNSS unserviceable.
(self translate to English!><)
I think.
Ships are strong for massive blackouted with Natural disaster situation.
It does not depend on external electric power, and unlike aircraft ATC also unnecessary, so not worry about a power outage on lands, It is possible to voyage for a long time.
Moreover, even if the lighthouse stop by comptely blackout, it can Navigation with GNSS(GPS) in Now era.
also can use the celestial-navigation in Clear weather situation if GNSS unserviceable.