What I'm talking about is the coastal-wide free service brought to you by SeaTow, who provide marine services like 'catastrophe response, environmental clean-up, vessel recovery, salvage, and on-water services'.
www.seatow.com and by ticing "Automated Radio Check" option, it shows stations in your area on a map, then just click a station to find your channel.
Around here it's channel 26..
This 83 second video shows you how it works:
Visit seatow.com and check out the member services, the Automated Radio Check is free, but their other services require membership, which involves a reasonably priced yearly fee.