Summary: Had a brand new unit. Just out of warranty, barely used, stop working. Took it down, looked like small amount of water intruded the case. All screws were tight, case was tight but apparently not tight enough. Have searched around and found others with similar thing happen. This thing needs to be more water tight. After all they are generally mounted on top of boats that travel saltwater.
Summary: I bought this unit just in case I get caught up in the fog and or in the pitch darkness which is rare here in Alaska in the summer months. After installation on top of a Radar white powder coated 4 and 3/4 inches tall 4 degree tilt forward base I found on some bidding site That also has a cut-out for mast light application and comes with aluminum light post holder. Not available on Amazon And So far while docked next to the side of the house unit works perfectly.
Summary: I purchased the GMR 18 HD radar to be displayed on my Garmin 4210 multifunction chartplotter. These are not toys but rather very sofisticated tools for any boat subject to fog and at night. Having the radar overlay onto my chartpotter is fantastic. There's great clarity associated with the 4210 but combined with this radar, it's great for getting back to port.
Summary: I have used this radar system for a couple of years mostly for my Coast Guard Auxiliary patrols including Search & Rescue. It has never failed me and the size is a welcome addition aboard my Parker 23 foot patrol boat. I highly recommend it.