I have the Garmin 60cx, although great for hiking, hunting and geochacheing it has too small a screen for fishing it will put you in the right spot same as any other but with fishing I like to combine gps with ocean geographical maps and the units for that are a bit to big for the hiker/geocacher. look at what Bass pro is offering and compare.
http://www.basspro.com/webapp/wcs/stores/servlet/SearchResults?hvarSearchString=gps+fish+locator&searchOption=products&storeId=10151&catalogId=10001&langId=-1&CMID=TOP_SEARCH_GO&x=17&y=16