Furuno FM-2710 Operator's Manual page 24

5) : "LCD Segments" : Shows the channel number in use. Select a channel with the Channel selector.
6) "LOW" : Appears when the transmitter output power has been set to Low power (1 watt) with the
[1/25]/Dim, or when a low power channel has been selected with the Channel selector.
7) "ALT" (Weather Alert) : Blinks when a weather alert tone has been received.
8) "TX" (Transmit) : Appears when the [PTT] switch on the microphone is pressed
and held. Transmitter output power is provided to the antenna.
9) "BUSY" : Appears when a signal is being received and the squelch is open.
10) "16" : Appears when the radio is in the DW mode, indicating that CH16 is being monitored.
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