VHF 300 Series Owner’s Manual Digital Selective CallingReceiving Position Request CallsYou can configure your radio reply automatically to incoming position requests, to promptyou to review and approve the incoming requests before replying, or to ignore incomingrequests (see page 27 for more information).If you enable automatic position replies, the screen displays “SENDING POSITIONCALLING” and sends your position when receiving a position request. After the call hasbeen transmitted successfully, the screen displays “POSITION SENT”.When receiving a position request, “POS. REQUEST FROM [VESSEL NAME or MMSINUMBER]” is displayed on the screen. If GPS data is available, press OK to send theposition reply. If GPS data is not available, the screen displays “NO GPS DATA. UNABLETO COMPLY”.Receiving Position Send CallsWhen receiving a position send call (position report), “POS. SEND FROM [VESSELNAME or MMSI NUMBER]” is displayed on the screen with the position data. Select OKto return to the Home screen.Receiving Group Calls1. When receiving a group call, “GROUP ROUTINE” is displayed on the screen. The radioprompts you to change to the requested channel. If the channel request is for an invalidchannel, “INVALID CH REQUEST” is displayed on the screen.2. Select OK to change the working channel.3. Select OK to return to the Home screen on the new channel.Position TrackingWhen you enable position tracking, your radio uses interval position-request calls to trackup to three vessels. Regulations allow transmission of one position-request call every fiveminutes. You can call up to three vessels that your radio will alternate calling at five-minuteintervals. If a vessel does not respond to five consecutive position-request calls, the vessel isremoved from the position-tracking list.The following timetable shows the polling sequence when you have three vessels in theposition-tracking list. The radio continues to send position-request calls until you stopposition tracking by selecting EXIT.Time 0 minutes 5 minutes 10 minutes 15 minutes 20 minutesVessel Polled Ship 1 Ship 2 Ship 3 Ship 1 Ship 2