As a patriotic citizen of Nigeria you ought to know some of these things which we will explain below about the Nigerian navy: The Nigerian Navy is a branch of the Nigerian Armed Forces which is among the largest Navies on the African continent, consisting of several thousand personnel, including those of the Coast Guard.
It is structured into a Naval Headquarters made up of the Office of the Chief of Naval Staff and 8 other staff branches each administered by Chief of flag rank.

These branches will be explicitly listed below:

Naval Engineering
Policy and Plans
Logistics
Training and Operations
Naval Safety and Standards
Administration
Office of the Navy Secretary
Account & Budget

There are 5 commands headers of FOCs and 5 self Governing units,these commands are made up of 3 operational commands namely below:

Western
Eastern
Central Naval Commands

These commands above are responsible for the protection and policing of the nation’s maritime environment; a Naval Training Command and a Logistics Command.

The Self Governing units are the Nigerian Naval Dockyard , Nigerian Naval Shipyard , the Naval Ordnance Depot, Nigerian Navy Holdings Limited, Naval Doctrine and Assessment Centre.
The Nigerian Naval Dockyard and Nigerian Naval Shipyard carry out third line maintenance and docking of Nigerian navy ships while the Naval Ordnance Depot stores Nigeria navy arms and ammunition and a limited storage for the NA, NAF and some paramilitary units.

These units and facilities mentioned creates and give room for the Nigerian navy to maintain the fleet for sustained operations.
Nigerian Navy Salary structure 2017