My wife and I lived for a few years on our boat "Rising Star" traveling from the U.S. to the Caribbean and cruising the U.S. coast.

See my article "How To Live Aboard A Boat" in the resources section below. 

Having internet access out at sea was prohibitively expensive for us since it still costs two dollars a minute or more. We did use a Pactor Modem and Amateur radio for slow speed e-mail access through the Ham network but this did not get us the internet.

We would go ashore in places where there were internet cafe's and use the terminals for a reasonable fee however we eventually found from other cruisers that there are often free, unsecured wireless networks available in many anchorages throughout the world.

Many yacht clubs and marinas are now offering free or cheap daily access to high speed internet via Wifi.

To pick these up out at anchor you need a high gain, long range Wifi adapter that includes an external antenna that you place up on deck, as high as possible.

There are models that use your laptop's USB port and are very versatile as well as easy to move from computer to computer. Others, such as the Engenius - Senao models plug into your laptops PCMCIA card slot and connect to an outside antenna. Ideally a directional antenna is best however these can be a problem if you are constantly swinging on anchor and not in a fixed position.

If that is the case an omnidirectional antenna is best. The "mirror mount' antennas that come with trucker's Wifi booster kits can be mounted on the life rails near the transom, out of the way. They are high gain antennas and will pick up wifi signals up to five miles or more since signals travel much farther over water.

In one instance we were anchored in St. John, USVI and were picking up a free wifi network across on the island of St. Thomas over seven miles away.

It can be fun to see just how far you can pick up open wifi networks with a booster and antenna and most of all you are saving a lot of money.

We have found an open wireless network in almost every single port we have visited.

I highly recommend these. They really do work!