Vox Maris VHF is a communications simulator of VHF GMDSS device, developed for students or whoever wants to learn and practice all the audio and DSC functions that these equipments offers. It is the only product in the market that runs on a single computer, with no need to have a computer network, and allows to see how the VHF devices works on a voice or DSC communication mode. With great realism, the student can practice ship-to-ship and ship-shore communications, try DSC calls of any kind (distress, individual, group, all ships, security, urgency or distress relay calls) and see the functionality of several operational features like DualWatch, Squelch, scan of multiple channels, among others.