Replies from the other station are read out loud. Speak your part with the talk button, or type it in the box.
Pick a message type to start
Each scenario gives you a situation. You decide what kind of call it is, send the DSC call on the radio, then make the voice calls. Everything is checked against the course procedure.
Procedures follow the Yam Sailing GMDSS course notes. Speech recognition needs Chrome or Edge with microphone access; if it isn't available, type your transmission instead.