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Whenever it is possible, I avoid tabs. Tabs made of 140g/m2 paper have enough rigidity, but their thickness must be taken into design, and can cause errors in build. Tabs made of typical office paper 80g/m2 are thin, but not enough rigid.
In this case, I had to use "special" material. It is a sort of semi-transparent, thin, very rigid paper, sometimes used as an aid in nautical charts trainings. You put it on the chart, draw lines on it and and safely erase them with a rubber, preserving your chart from wear and tear.
Ask some skipper to get detailed explanation.
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