Humminbird DC 25 - Manual (Page 7)

HI/LO selects the power level for transmission. HI transmits at the maximum legal wattage for
each channel, usually 25 watts; LO transmits at 1 watt. Use LO for in-port or short-range
communications, HI for longer range communications. The current HI/LO selection is indicated on
the LCD screen. Holding the HI/LO button down while transmitting will override the low transmit
default on USA channels 13 and 67, and International channels 15 and 17.
WX selects the Weather frequency band (Weather Channels 0 through 9), as shown by the WX
indicator that appears on the LCD screen. Note that the Weather channels are receive-only;
pressing the microphone button when you are in this frequency band turns off the speaker, but
transmits nothing. To return to the USA or International band, press WX again.
USA/INT selects the USA or International frequency band, which each provide access to
Channels 01 through 88 (see “Table of Marine Channels” later in this manual), Use the USA
frequency band in domestic waters or for communications within 14 miles of the U.S. coastline,
and the International frequency band for communication beyond 14 miles outside of the U. S.
coastline. The current USA/INT selection is indicated on the LCD screen.
CH 16 switches the radio immediately to Channel 16 in the last frequency band selected
(USA/INT).