I am looking to add a GPS chart plotter to my 1986 H-34 to be used mostly for cruisuing the Chesapeake Bay area. I am considering the Garmin 276c as I like the idea of not having to run any extra cables (built in antenna, rechargeable battery, & affordable price) to mount it to my pedestal rail above my compass. Does anyone have experience with this set up or are there better options?