NavList:

david: thank you for the hs of your work sheet. I still have some trouble with the numbers ( cel.nav. people have to like numbers or they are in the wrong avocation). on the work sheet; hc is 25.52'& ho 25.55' with int 3'. however you gave me hs 25.55'so with a +48' corr. to ho 26.43' ; I get ho 26.03' so using the old hc 25.52' int. is 8' or new hc of 26.40' int. 37' I note the new hc is 48' greater than the work sheet hc. if I am confused just let me know. some suggest taking an ul. and ll. bubble reading to average but it is tough enough to get a wobbly central bubble without doing it twice. a pendulum alignment would certainly be helpful.  thanks tom.k.