Here you will find information on the Crisher-Souva naval data set.
For the 1865-2011 country-year data set, click here (Dataverse 4.0 link).
The proper citation for those using the data set is:
Crisher, Brian and Mark Souva. 2014 “Power at Sea: A Naval Power Dataset, 1865-2011” International Interactions. 40(4) 602-629.
Any errors or questions about the data set should be directed towards Brian Crisher.