# Where are the seaport conventions for VFR charts explained?

VRF charts contain information about seaports. For example, 00 - 50 in the formation block for HNL seems to be for a waterway:

Another example is 23W for 1C9:

Where are these conventions explained? I can't seem to find them in the Legend or User Guide.

• Do you have a reference for the W suffix? I found a reference about 00 - 50 on page 16 of the Aeronautical Chart User's Guide. May 20, 2020 at 4:32