For the ultimate safety, add a battery powered rechargeable handset to your Cortex. Have situational awareness and VHF communication at your fingertips, no matter where you are on your boat. This is a stand-alone wireless handset model.
Garmin 010-02816-10.

Rechargeable, portable battery powered handset for connection to Cortex M1 4-inch multi-touch display with gorilla glass for maximum durability
Single hand operation with unique click wheel and dedicated buttons
Wet and gloves capable touchscreen
Optically bonded display for wide-angle and sunlight viewability, even in the harshest midday sun.
85 dBA of crystal-clear audio
Combined AIS and VHF display with voiced alerts
Touch a vessel onscreen for direct calling (DSC)
Add 10 handsets to Cortex M1

Cortex Demonstration: Tethered & Wireless Handset from Vesper Marine on Vimeo.