Nexus 7 (FHD, the better model) was the best tablet I’ve had. I used it even as a phone replacement for a couple of years.
Now I’m using a Galaxy Tab Active 3 as a chartplotter on the boat. Also quite nice, but would be too slow for a “main device”. Not to mention camera quality.
I have a Raspberry Pi running Signal K on the computer. This transmits all boat sensor data (depth, wind, GPS, AIS targets, etc) to the tablet. On tablet I can then run a chartplotter app, for example Navionics, SeaPilot, OpenCPN, or my current option, Orca CoPilot.