BoatWave is a consulting firm. This is one of the better sites. Read over their comments about coverage and security.
If you intend to offer a free hotspot then most of the security
suggestions are not appropriate. I will provide a link later on that
will have suggestions for these security issues at free hotspots.
Beacon WiFi A North, East Coast Marina Service Provider. Web site is VERY busy.
WiFi Marine
is a consulting firm for WiFi-enabled marinas, including
instructions. I don't recommend this site but it is included here for
completeness.