285r Access Menu 3–1 to program your call sign(9 digits max.) {page 17}.t Enter a message (or bulletin) using up to 64alphanumeric characters {page 30}.y If you want, access Menu 3–P (for messages) orMenu 3–O (for bulletins) to program group codes{page 34}.u Access Menu 3–C to select the operation methodfor transmitting {page 25}.The APRS supports a function for sending a messageor bulletin independent of position reports. You can senda message to a single station only or a bulletin to allother stations. You may use a group code to exchangemessages among members in your group or to rejectunwanted bulletins.Each message which you transmit can consist of up to64 alphanumeric characters. A maximum of 16 incomingor outgoing messages can be held in the messagememory.OPERATION FLOWThe following steps should guide you to a good start ofAPRS Message operation.The method for transmitting differs depending on theselection in Menu 3–C. See page 32.When you send a message (not a bulletin), a receptionacknowledgment should be returned; “ack0 ~ 9 (or A ~ Z)”appears. If your message is rejected by the recipient,“rej0 ~ 9 (or A ~ Z)” appears.Note: When using an optional VS-3 unit, you may select “APRS ONLY”in Menu 1–2–4 (VOICE). Each time you receive a message addressedto you, the transceiver announces the call sign of the sender. If the initialcharacter of the message is %, the transceiver announces thesubsequent characters one by one.Now you are ready to receive a message from otherstations. Refer to “RECEIVING A MESSAGE” {page 29}.To transmit a message, proceed to step t.APRS MESSAGEq Access Menu 3–I to select band A or B as the databand {page 13}. The default is band A.w Press [F] (1 s), [TNC] to enter APRS mode.• “TNC APRS” should appear.e On the data band, select the same frequency asother stations in your group.• You may tune to the frequency of an appropriatedigipeater network (144.390 MHz in the U.S.) {page 9}.