Thanks for all the ideas (some better than others) and advice (ditto) ....But have pretty much figured out that I can simply take photgraphs of the Admiralty charts
I used. All my tracks, with noon positions, of offshore
trips are on these - although it appears I will have to use some easy-to-remove masking tape cut into very thin strips to make tracks easier to see, once photographed, than original pencil marks. Then once I take picture,I can just remove tape.
Tried using Maxsea
and Nobeltech charting programs and making approx tracks with waypoint/projected course function - but by the time you zoom out to cover even just half of the Pacific, or all of the Indian Ocean
, for example waaaay too much information is lost
Anyway, for my purposes, it appears that pictures of the charts will work just fine.
Also, you gotta admit, a real chart, complete with fold marks, noon positions, wrinkles and coffee stains is way more interesting, than a clear, crisp digital image!!