Boating and using VHF boat radio basics. Do we still need marine VHF radios?

I look at the VHF marine boat radio. Why do we monitor channel 16, and is a VHF boat radio still an essential piece of boating equipment? I admit I was inexperienced and only used it for weather last year. Does it do things my cell phone cant do?
More (and BETTER) information regarding VHF marine radios for boaters can be found here:
www.navcen.usc...
Here's a VHF radio with GPS built in: amzn.to/2Syeysi
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