Hand Held VHS

I want to weigh the pros and cons of a handheld VHS radio for the boat. I do not have a fixed radio in this boat. My reason for going with a handheld would be the cost of installing a fixed one. I don't think I am willing to do it myself.

What features are important? Would lithium battery operated units be advantageous to Nickel Metal Hydride. (I won't consider a NiCad due to the inability to top off the battery)

I might consider installing a cigarette lighter so I could plug a VHS into that.

Thanks for your advice
Island Girl