Product and system overview ContentsProduct overviewThe Ray90 and Ray91 are 12 V dc, Class D Digital Selective Calling (DSC) VHF radios. DSC enables you to make and receive calls to a specific radio, and to transmit and receive position information to and from a selected radio. DSC also allows transmission of a distress alert, to all radios within range, at the touch of a button. Once a DSC request is sent and acknowledged voice communication is carried out on the channel chosen by the caller. The radio can transmit and receive on all available US, Canadian, International and Private marine VHF channels.Required additional componentsYour product requires a VHF antenna to function as a radio. If you intend to use the radio’s internal GNSS (GPS) receiver then you will also require a GNSS (GPS) passive antenna to be connected.Optional wired componentsThe following optional components can be purchased to create a second wired handset station.Optional wireless componentsYour radio supports connection of wireless handsets and speakers via a wireless hub, enabling creation of additional fully functional, wireless handset stations.Compatible MFDs / ChartplottersImportant compatibility information.Incompatible Raymarine MFDs / ChartplottersThis product is NOT compatible with the following Raymarine® MFDs / Chartplotters:Software updatesRaymarine® periodically releases software updates for its products. These updates provide new features, current feature enhancements and bug fixes which improves product performance and usability. Previous topic: Document and product informationNext topic: Licensing