mm. The reason I mentioned it was when I used SeaClear twith my old bsbs, it got them very wrong. but maybe it's not it's fault.
-many of these bsbs have datum in the text-header written as NAD27 but were actually calibrated
as wgs84....I can't swear to this reasoning because nobody else has reported the same error with these charts
in Seaclear. and I haven't bothered with Seaclear much since.....
SeaClear apparently took the "NAD27" seriously showing a consistent error that roughly matched NAD27 but other program ( Opcn, Maxsea
, Ozi, VisNav) showed me where I knew I was.
Since some of these bsbs were NAD83, and showed accurately in SeaClear, I would have to hassle with changing the gps
output back and forth. (Oh, the good ol' (not-so) old days! )
It's a lot simpler to have em WGS84 in the calibration.