Today, many chartering companies provide services that allow you to conveniently use your electronics, so no worries about getting in touch with anyone! If you'll need to use your cell phone during your trip, first check with your provider to see if services are available for your destination. Some providers may have a "roaming agreement" with the country you visit, but roaming charges add up quickly. Many chartering agencies offer cell phone rentals for about 10 to 20 dollars the whole trip. Fees tend to be low and you can always buy more minutes if you run out of talking time.
If you bring laptop onboard your boat and would like to use internet, rent a wireless modem with your boat. These usually cost around 30-40 dollars a day and you get them either through the chartering agency or from a marina you moor at. Enjoy internet access from anywhere on the boat so you won't have to miss your emails on your vacation.
While most chartered boats today still come equipped with old fashioned CD-playing stereos, some offer I Pod compatibilities. Ask if your sound system comes with these capabilities and listen to all your favorite songs without bringing along all your CD's!
Either a diesel or gasoline powered generator runs all things electrical on your boat. In case of a blackout, each boat comes equipped with a backup generator. Today, all boats have GPS systems for navigation and VHF-FM radios, but no radar.