Less than 0.5% of entries will differ from printed tables. The vast majority are due to rounding or truncation at extreme levels. When high precision sources were used to check differences during program testing, half agreed with AstroNav.
Nautical Almanacs in pdf format for the previous twenty years are available on the Downloads page. These can be checked against printed almanacs to verify AstroNav’s accuracy.
(A few publishing errors were identified in printed Almanacs during testing. A difference > 0’.1 or 1m is almost certainly a publishing error!)