And its OK on the laminated UK maps, but how do you manage this when using foreign maps which in my experience are generally paper based (France, the Jeppesen Maps, Australia...)
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When flying in Africa and France, I buy the charts then I laminate them!
On the UK charts I too use OHP pens and I also write down a/g, ATC frequencies of aerodromes near track and diversionary fields.
If I have time/facilities - I then colour photocopy the route from the chart. I can then stuff the chart down the side of the cockpit and work from a series of A4 pages - much easier than playing trainee-origami expert in a Pitts!
My little aeroplane only has a compass and a handheld GPS which I only use to confirm where I am and check groundspeed.
My six times table and 3 times table are quite good so calculating waypoint eta's from a refreshed groundspeed normally doesn't cause me too many probs
One day I'll have an aeroplane that has enough space to operate a whizz wheel, unfold a map and will re-learn to use VOR/DME/ADF/Loran/TACAN, etc
Stik