Hiya
Welcome to Sealine!!
We have a special boating section on the forum, that adresses all your boating needs and posting your thread there will ensure better and more responses from the boating anglers.
On my previous boat, i had the Furuno GP7000F, which is a brilliant unit!! Has a decent plotter and a VERY good echo/fishfinder.
The Garmin GPS60CX is a very good little hand-held unit. On my current boat, i used the same unit for more than a year, as my prime GPS unit. You MUST buy the holding/mounting bracket and external power cable. The handheld GPS's eat battery power, so an external power cable is a must.
The Garmin unit has a very handy compass page, which shows you what direction to travel. This makes it very easy for inexperienced boaters, junior anglers, or new crew to be able to able to navigate the vessel. This is a VITAL aspect, as should anything happen to the skipper, the crew MUST be able to take you back to port.
Pictured below, on the top left of the console is my Garmin GPS60CX, which is now my back-up unit: