The Nigerian Navy Salary structure is an information that you won’t
come across easily on the internet.
This report on how much a Nigerian
Naval officer is being paid was culled from Leadership Newspaper (2014) 

According to the report, below is what some ranking officers in the Nigerian Navy earns on a yearly basis as of September 2014:

Nigerian Navy Salary structure

Admiral in the Nigerian Navy – N16,303,140
Vice Admiral earns ₦13,363,229
Rear-Admiral earns ₦12,038,945
Commodore earns ₦7,385,856
Captain earns N3,715,859
Commander earns ₦3,380,086

Although we couldn’t find the Nigerian Navy salary structure for its
lower ranked officers, officers ranked at Rear Admiral or above do earn
lifelong full-salary pensions, while those ranked at Commodore or below
receive a pension of five years’ worth of their salary.

You can also see the various Ranks In The Nigerian Navy