Seafarers have several technological alternatives to call family and friends on shore. GSM and satellite communications, including satellite phones, mean that sailing the oceans is not quite as isolating as it once was. However, maritime communication can be expensive, so options are available that are designed to minimise costs. One of the ways crew can do this is to use a global roaming subscriber identity module (SIM) card. A UK-based provider is Geodesa, which supplies GeoSIM, with around 15....

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