Attacker: Hack and temporarily disable regional "Electronic Chart Display and Information System" (ECDIS) implant spoofed data at restart, embedded course chart with port approval could cloak massive explosive ordinance in a ship that in turn, wipes out harbors and drydocks of foreign naval power en mass.

With 90,000 ships at some point in transit around the globe this is not a challenge.

AIS data is easily spoofed and without a verifiable visual log, there is much room for slipping a few ships near ports.

Once naval power is depleted and domestic repair functionality damaged, foreign reliance creates security risks and coverage gaps balloon.

The same attack could be repeated multiple times and then in the weeks following the attacks, disabling the nation's naval maritime radar and satellite capabilities would degrade their ability to manage assets.

I dunno, just an off the cuff notion. If naval capacity both military and commercial, flight and previously deployed assets become desperate lifelines.

Makes sense to me, but, I imagine anyone with real macromilitarial (comprehensive war planning) experience could poke holes in this.

Asymmetric attacks like this could mask state actors for a short period.

TL:DR Disrupt the ability to track ships and embed hostile units by spoofing "friendly" or "commercial" transmitter data.

Use those to attack naval assets and infrastructure.

In the following fog, go after permanent disruption of naval traffic tracking.

Go after deployed craft and opposition friendly ports.

ELI5: Tracking boats is easy. https://www.shipmap.org

Hide bombs in a boat. Blow up some enemy boats. Destroy how they track boats. Chase down all the boats that you didn't blow up.