I'm upgrading to the new GMI 20 and GHC 20, so these have been removed and are for sale. I have two of each due to having dual helm stations. All units have been in warm and dry environments, not exposed to salt spray, and are in great working order. (I have covers for all of them, just left one at the boat and missing from the GMI pic)
GMI 10, I have two, $300 ea
GHC 20, I have two, $100 ea