here is a link to a surveying site with download of the good old Bowditch long term almanac together with a shortstory (two links) and a copy of the Bowditch long term almanac as PDF, great to print a few of these and have around, it is just a few pages and works to within 2.2' at worst and likely less
AmeriSurv.com - Long Term Almanac, or, what to do when you can't use your total station and GPS
the short-story is actually a nice tutorial on terrestrial astronavigation with pretty in depth
discussions between the old surveyor
and his helper on precision, formulas...
If you like astronavigation you know that the two hardest things to carry along are sextant
and Nautical Almanac.
Dr. Geoffrey Kolbe's Long term almamac 2000-2050 is easy carry and has sight reduction table included, the Bowditch version is an even easier carry -5 pages- true no sight reduction table and bit more math involved but what do you expect from 5 pages.
in my poinion the perfect compliment to this almanac is the Sight Reduction Tables by Henning Umland, especially the smaller one.
I admit the larger one allows great precission even enough for for lunar distance calculations but the size is factor in most grab bags.
the smaller one is usually within 1' or so as far as I have found and together with the almenac you would be able to see everything inside your "circle of theorethical precission", let us say 3,5'.
as most of us know in practice on a small vessel it would be wise to add 2-3' of "wobble" (both mathemathical and practical).
Oh and as for lugging sextant
, check out the Bris-sextant, fits in a film can together with calibration sheet and instructions.
if one wanted to go Spartan i gues Bowditch-longterm+short-tables+bris-sextant+wristwatch should all fit in persons pockets, 10 printed sheets
(if printed both sides) and a filmcan is not that much and would still allow navigation
to within range where coastal piloting can take over.
I have actually reduced both the bowditch almenac and the table to 44% when pi printed them then carefully trimmed the edges and had them laminated and spiral-bound, hard part was getting the firm to carefully get the punched holes through plastic only with few mm margin to avoid water
to "bleed in", it is what I use for my grab bag.