NavList:

Yes, that was the point I was making. When you see values changing rapidly/slowly on the tables, you know that 211 is not good for that shot.  Just pick another body that is further away from the "danger zone". If you must use that shot, you can use Sadler's escape hatch or NAO Concise. I think 211 is better than the NAO's Concise table (slightly) for someone that uses neither frequently. There are just so many errors.

I have a reduction form for both that has checkboxes (error traps), and that can help I suppose. My 211 instructions allow me to do it on a small piece of scratch paper. Ageton's (211) tables can be made VERY compact too so that you can have instructions on one side and the table on the other laminated to put in your lifeboat. You can also make a compact Sun ephemeris the same way. A small Ageton's table + Sun Ephemeris + Davis Mk3 you have a basic idea of your lat/lon +/- 5nm pretty easily. Within easy sighting of a flare gun from a plane. But I supose EPERB makes this irrelivant unless the EPERB is not working.

-Chris