[Pblais]

The compass rose is more by tradition than in aviation. Nautical charts didn't know about true north. I tend to navigate by magnetic north though winds and currents are always expressed in true north. Always working in true north is the better approach.

I should think all your Nav tools would be welcome on your nav station on board. Computing vectors graphically on the paper chart is the classical approach. Parallel rulers for walking vectors across the chart work better on a ship than a small cockpit in an aircraft. Wind and water compute most similarly though computing standard elevation is mostly pointless on board ship.

It would be interesting to see how suited the E6B was for plotting and computing aboard. Given your familiarity I'm sure it would be better not left behind. You do have a lot more time to plot course. One of those things where you are sailing along watching the sunset thinking you'll need to plot a new course in the morning.

The Loran system was just updated for who knows what reason but it's not easy to find the receivers. I thought I heard it was going to be the last time. Now with SA turned off the GPS system, Loran is a bit old school given the range is not that great.