I looked this up but it said FM not Cellular, I know Cells are microwave radio transmission and i suspect with Frequency Modulation but I have to check is this the same thing? And do you need to sign up with your provider?I'm using a 10" Dragontouch Android tablet running Navionics and OpenCpn. Same apps and function as the phone but with a nice big screen. You have to get a cellular capable version to get the built in GPS, but they're easy to find. $120 on Amazon. You often hear people say they're using an "iPad" for this, but I hope they're using the term generically like using "Coke" to mean any kind of soda. A real iPad is about five times the cost of the Dragontouch, and in this application doesn't do anything the Android won't.
That is exactly what I did in my cockpit. I use a Samsung TabA in an otterbox rugged case along with the built-in Ramarine chart plotter. The tablet is way more convenient for zooming in to look at detail, measure distances, etc. The built in chart plotter feeds data to all the other instruments, vhf etc.You can buy a cig plug which has a USB and one with a USB and another cig plug/outlet.