Looking for advice on a easy to use GPS unit . I am a novice when it comes to electronics and never used the electronics that have been on the boat which are 10-12 old with the exception of the fish finder (6yrs. old) which I use for the depth finder . I am looking for a unit that would be a depth finder , tell water temp. and of course GPS characteristics . Will I need to go to a class in order to use this or do most of the companies that install go over everything with you ? My price range is $1000 - $1500 . Is my budget enough or am I wishful thinking . Not interested in a hand held the screen is to small and gives me a headache . Thanks for any advice