Question about Garmin GPSMAP-640 GPS Receiver
In the automotive mode, the sound is very weak and the volume controls don't turn it up. how do i get louder audio in this mode? Do I need to connect to my car radio?
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Posted on Jan 02, 2017
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To receive XM weather or audio, the GPSMAP 740s requires a GXM 40 Smart Antenna with XM subscription.
Once a GXM 40 Smart Antenna has been connected to the GPSMAP 640, the device can display the subscription information for the antenna.
From the Home Page in Boating mode:
From the Home Page in Driving mode:
The subscription information will now be displayed on the screen.
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