Depending on what you need, here are the most relevant "posts" or documents for N45: 1. U.S. Federal Regulations (Title 45 CFR)
: The primary document for this division is OPNAVINST 5090.1D , which outlines the Navy's Environmental Readiness Program [14]. N45.zip
In some countries, like the , "N" prefixes are used for North London postcodes, but "N4 5" would be the standard format rather than "N45" [16]. Depending on what you need, here are the