Garmin GDL 3D 39

Garmin pilot asks about cabin pressure in settings for the gdl-39 3d, too, so I kinda suspect the stratus has nothing on it. What do you want for it? I don't see an asking price listed, just the retail.
 
Awesome, I stand corrected then. So then what's the difference between the 2 and 2S? A pressure sensor? Seems hardly worth the investment.
 
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