The scanning modes can be used in conjunction with one another, or used separately.

Pressing and holding 16/9/TRI, for example, starts and stops TripleWatch mode. TRIWATCH is shown in the display when it is selected. There are insufficinet characters available on the LCD panel to display “TripleWatch.”

Pressing and holding WX/ALERT starts and stops Weather Alert mode.

Pressing SCAN/MEM quickly starts and stops Normal

Scan mode.

You can choose either Dual or TripleWatch (whether or not Channel 9 is scanned as well as Channel 16) by making a menu selection. Press MENU, then use ▲ or ▼ to reach Dual/Tri Watch. Next select 16/9 TriWatch or 16 DualWatch. Press MENU again to return to radio operation.

AM, FM, and AIR Bands: You can store up to 25 frequencies in memory for the AM. FM, or Air band, press and hold SCAN/MEM for about 2 seconds until you hear a double beep confirmation. Memory appears on the display.

If you want to remove a frequency already stored, with that frequency displayed, press and hold SCAN/MEM for another 2 seconds until you hear the double beep sound. Memory disappears.

Once you have stored two or more frequencies in the AM,

FM, or AIR band, you can move from station to station within that band [Station Preset] by pressing SCAN/MEM briefly then using ▲ to jump from station to station.

Normal Scanning

To activate Normal Scanning, momentarily press SCAN/ MEM. The radio scans all the channels you stored in memory from lowest to highest. The VHF marine band display shows

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Uniden MHS550 manual Normal Scanning