At USCG NavCen Maritime VHF Narrowband Channels - 12.5 KHZ there is a table of 12.5 kHz split marine channels authorized under 47 CFR 80.371(c)(iii). Based on the how I understand it, there appear to be three errors in the table, which I also find in Monitoring Times, July 2004, p. 16.
I submitted a report via the NavCen website's contact page.
- Channel 279 Ship TX says 156.9775, but 156.9875 is the correct 12.5 kHz split between adjacent channels 20 and 79.
- Similarly, channel 279 Coast TX says 161.5775, but 161.5875 is the correct 12.5 kHz split between adjacent channels 20 and 79.
- Channel 287 Ship TX says 158.3875, but 157.3875 is the correct 12.5 kHz split between adjacent channels 28 and 87.
I submitted a report via the NavCen website's contact page.