I use a tablet on board upstairs to supplement the main nav laptop which stays downstairs. Also I feel that 2 sets of charts (Navionics and C-Map) provides a bit of a backup. I have a regulation-issue waterproof case I got from Whitworths, it seems to do the job. The big advantage of the laptop is that the wind instruments, AIS, etc, all feed into it, not an option for the tablet. The laptops I prefer are Panasonic toughbooks, which can be had for a reasonably cheap price second hand on eBay and similar sites.
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