GMDSS: Element 7R

1. A Responds to interrogations by a vessel's X-Band radar and transmits a signal.
2. B This is a 6 GHz transponder capable of being received by a vessel's X-band navigational radar system.
3. C This is a 9 GHz transponder capable of being received by a vessel's X-band navigational radar system.
4. D Transmits a distinctive 12-blip signal for easy recognition.

Tip: press A-D to answer