I am selling several brand-new GNSS high precision heading board with low price ($400/each, the original price is $650/each), and below is the description of this product:
UB282 is GPS/GLONASS dual-system dual-antenna board for precise RTK position
Designed to carry the Go Pro camera of your choice, the 3DR Iris+ is a proven ready-to-fly HD camera drone that’s packed with advanced GPS autopilot and camera modes that only 3DR offers.
I have a MicaSense RedEdge3 (purchased mid March 2017) installed on a 3DR Solo. This setup has been excellent for small to mid-sized projects (10Ac - 100Ac @ 400Ft AGL & 80% Overlap).