I don't even up date the charts on the yacht, just buy new ones every couple of years, but do update the electronic charts in the two GPS plotters.
Couple of thoughts, if its a long trip then right yourself a route card by obvious way points on a piece of plastic with chinagraph pencils (wax crayons) or on paper in a plastic wallet and tape it to the tubes for easy reference.
I lost our charts which were in a water proof map case at Cape Wrath on the Round Scotland, they just blew out of my hands. The following day the GPS packed up on the menu screen so no information at all. Thankfully it was an easy route down the East Coast of Scotland using the rev counter to judge the speed and a stop watch to run time/distance calculations in my head.
A hand held GPS would be a cheap accessory to keep on board, with home and destination programmed in.
Ribnet is best viewed on a computer of some sort