[GadgetKen]

Not listed in Cingular or T-Mobile websites as having a satellite GSM microcellsite (they list vessels under international roaming). That doesn't mean they don't have one (may be worth your contacting Princess to double check). They apparently do have satellite internet access including wi-fi:

"INTERNET AND E-MAIL ACCESS*
Internet access is available on all Princess vessels through our onboard Internet Caf?s and wireless networks. Use our stateof- the-art computer systems to access your web-based e-mail account, or browse the Internet for world news, sports and stock trading. Or bring your wireless-enabled laptop and access the Internet from the comfort of our beautiful Purser's Lobby/Atrium and the surrounding lounges and bars*. Wireless network cards are also available for purchase onboard.

Passengers who subscribe to e-mail services from an Internet Service Provider (ISP) are advised to verify that their ISP has a web-mail viewing site prior to sailing. Most major ISPs have websites that allow mail access via a web browser using an e-mail address and password.

Please contact the Passenger Service/Purser's Desk onboard for information regarding the charges that apply to Internet and wireless services, the hours of operation and any other specific requirements.

* Note: Vessel Internet access and television programming are not guaranteed to be available at all times due to the nature of satellite connections, which are subject to disruption from weather and land-based obstructions. "

A small laptop and a wifi card might solve your problem.

Public satellite phone calls aboard ship (either direct or through GSM to microcellsite satellite relay) are generally expensive. Cingular is $1.69 or $2.59 US and T-Mobile roaming is $4.99/minute. Direct satellite calls are generally $7 and up and there may be a wait to be connected to a call through your stateroom. A rental satphone would be less expensive per minute.

Cheaper way out is just wait until you're in port and your blackberry should roam OK(remember you're on vacation!). St. Thomas is a US territory and roaming should not be that expensive(T-Mobile likely roams on Cingular GSM and Verizon on Sprint CDMA at 1900 Mhz; my Virgin Mobile/Sprint CDMA phone works fine there). St. Marteen and the Bahamas are both international roaming situations and will likely be billed at higher rates if there is frequency and digital standard compatibility. Or just go to an internet cafe to check your email while enjoying a cup of coffee.