Watch Modes
Regulations may require you to monitor channel 16 at all times. You should check with your local maritime safety authority and make sure you understand your watchkeeping responsibilities.
You can use watch modes to scan the entire VHF band, or monitor channel 16 and one or more other channels at the same time.
Scanning All Channels
You can scan all channels to get an overall picture of VHF traffic in your area.
> All.
As the radio detects traffic, the channel numbers appear along the bottom of the screen , with the most recent traffic on the right.
You can select a channel on the bottom of the screen to tune to it and stop scanning.
You can select 
to replay recent traffic on the current channel (Replaying Recent VHF Activity).
Monitoring Multiple Channels Simultaneously
Before you can monitor more than two channels simultaneously, you must save the channels you want to monitor as presets (Saving a VHF Channel as a Preset).
> Presets.
When the radio is playing traffic from channel 16 or one of your presets while you are tuned to another channel, the preset button for the channel with traffic is highlighted , and that channel number appears in the middle of the screen instead of the number for the channel you are tuned to.
Monitoring Channel 16 and the Current Channel Simultaneously
> 16 Only.
When the radio is playing traffic from channel 16 while you are tuned to another channel, the channel 16 button is highlighted , and that channel number appears in the middle of the screen instead of the number for the channel you are tuned to.
