Audio Connections
You must turn off the device before making any audio connections. Connecting audio equipment while the device is turned on may cause damage to the system.
You should protect all terminals and connections from grounding and from each other. Failure to do so could result in permanent damage to the audio system and void the product warranty.
You can connect a hailer loudspeaker to verbally address your passengers and crew by speaking into the fist mic.
You can connect an external speaker to play incoming VHF transmissions. You can purchase a suitable external speaker for the Garmin Signal™ VHF radio from your Garmin® dealer, or you can go to garmin.com/SignalVHF-Accessories.