Satellite communications are becoming more common on cruising boats. Many boats are now equipped with satellite telephone systems; however, these systems can be expensive to use, and may operate only in certain areas. Many cruisers still use short wave maritime SSB and amateur radio, which has no running costs. These radios provide two-way voice communications, can receive weather fax graphics or GRIB files via a laptop computer, and with a compatible modem (e.g. PACTOR) can send and receive email at very slow speed. Such emails are usually limited to basic communication using plain text, without HTML formatting or attachments.