I have a Garmin 76 S. It's a hand held. Gives direction when you are not moving, has a map and sells for less than $200. (I paid $192). I use it along with my console mounted GPS. Tip: Put velcro on the back and attach it to your boat panel .
dick's seem to have sales with factory rebates a lot keep an eye out in the circulars. my buddy got a little garmin then the cd to download on the comp it is cool and works great. at the time i dont think he paid more than 300$ for the unit and the disc.