From what I’ve seen of the ol’ faithful E6B, it will last longer than the plastic, British CRP1 due to it’s choice of material ie metal. Should be suitable but don’t quote me!
For marking the computer and your charts, stick your foot down and use washable OHP marker. If you say wish to remove part of your track line to read a frequency or feature, how then are you going to do so if using permanent marker? Unless you waving your chart around in the rain, non-permanent marks will stay there until you rub them off. This is easily done compared to the fuss created with meths/solvent and permanent marker. No solvent means one less thing to carry around.
Likewise pencil marks on the computer can be difficult to shift. Non-permanent OHP pen can be washed off easily with fingers if need be. If the marker starts to build up, a Staedtler Mars plastic eraser will easily shift any gunk.
Chinagraph by the way is old hat comparitively, expensive and you get through the pencils very quickly.
New southern half mil charts by the way are to be issued mid-March iirc.
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