CHANNEL SCAN at the bottom. The FRS band displays SCAN.
TripleWatch and DualWatch Scanning [VHF - FRS]
For the marine, weather, and FRS bands only, to initialize the TripleWatch scanning mode,
press and hold 16/9/TRI. Now TRIWATCH SCAN appears on the LCD’s message line area. The scan check sequence
becomes — the working 
A channel is checked then the
radio checks Channel 9 and
then Channel 16, in that order, every 2 seconds.
If you have set DualWatch as your default mode, by selecting that option from the menu, Channel 9 is not checked and DUALWATCH SCAN appears on the display.
To disable Triple or DualWatch and revert to Normal Scanning of stored channels, press and hold 16/9/TRI for
2 seconds. Channel 16 and 9 are no longer checked. The radio continues to scan only channels stored in memory. CHANNEL SCAN appears on the bottom and each channel number is displayed in rapid sequence.
52 | Uniden MHS550 Radio Owner’s Manual |
