I have had a few Garmins before and like them also!! As far as the radar I hope it will be fine, as I do not use it much, Just when the fog rolls in, so I am sure it will be fine.
I have a Furuno Fish finder and it is the best I have ever had!! I have no intention of getting rid of it! I really hate to have all in ones, but really needs the room on the dash for a 10" screen and the radar is the least used and I am sure will be fine.
The HDPI is the 200hp and it will be a loss of 25hp to me but the weight difference will be great for my boat
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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