This article on Marine Surveillance shows the need for regular satellite security for marine mobilities:
Regular surveillance of territorial sea areas is increasingly important for coastal nations. Signatories to the United Nations Convention on the Law of the Sea (UNCLOS) can establish a territorial sea out to 12 nautical miles from the coastline and an Exclusive Economic Zone (EEZ) of up to 200 nautical miles. These marine areas are then an economic resource for a coastal state (e.g. for fisheries or oil extraction) but that state must then take responsibility for the administration, law enforcement, environmental protection and sustainable management of this frontier. Development, implementation and enforcement of policy and legislation require systematic surveillance of these areas but this is very costly and logistically cannot cover all areas all of the time.