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7. Selecting High/Low Power
You must press and release the HI/LOW/LOCK key to toggle the transmit power between High
and Low. Select HI (High Power Transmit) for long-range communications, and LOW (Low Power
Transmit) for shorter-range communications to save battery power.
To change the transmit power:
1. Press the HI/LOW/LOCK key to toggle between High and Low transmit power. When the
radio is operating at high power, the HI icon appears on the LCD, and when operating at
low power, the LOW icon appears on the LCD.
8. Locking the Keypad
Use the HI/LOW/LOCK key to activate the Key Lock function in order to avoid accidental key
presses of the radio keypad.
To lock and unlock the keypad:
1. To lock the keypad, press and hold the HI/LOW/LOCK key until the Key Lock icon appears
on the LCD.
NOTE: Once Key Lock is turned on, pressing the keys will have no effect except for the Push-
To-Talk (PTT) key, which is not affected by Key Lock.
2. To unlock the keypad, press and hold the HI/LOW/LOCK key again until the Key Lock icon
is removed from the LCD.
9. Selecting a Weather Channel
The U.S. National Oceanic and Atmospheric Administration (NOAA) broadcasts continuous
weather reports and severe weather alerts, as needed. Your Humminbird® VHF55S is programmed
to receive 10 NOAA weather channels, and to sound an alarm if a weather alert is received. The
A icon will appear on the LCD above the WX icon if there is a Weather Alarm. See Marine
Channels for a list of channels and their frequencies.
T
o select a weather channel:
1. Press and release the WX/BAND key to enter Weather mode. The WX icon will appear on
the LCD. After selecting the WX band you must press and hold the WX/BAND key for three
seconds to receive weather alarms. The weather alarm icon will appear on the display.
2. Press the Up or Down Channel keys to change the WX channel from 1 through 10.
3. Press and release the WX/BAND key again to return to normal operation.
NOTE: Weather broadcasts are available in North America, but may not be heard in all parts of Canada.
NOTE: During Weather mode, the PTT, Scan, HI/LOW/LOCK and MEM keys are disabled and an
error beep will sound if they are pressed.
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