not sure if my non-expert guesses will help and I'm with windows so for me,on Linux
, I'd be running wxtide in WINE. because wxtide can read the text type HARM and idx files, so it's just way easier...especially in the testing?
In fact, better yet, OpenCPN
can compare various db at the same time ,if the stations don't exactly overlap geographically.
Reading your posts, these occur to me:
x 0 0 is merely a placeholder for a zero value or no data available for the expected value so,
" S6 0.0000 0.00 "would be "x 0 0" in the other db
I found errors will spring up if you don't have the correct number of lines in the db- again, a certain number of values in a certain order are expected by the application to do its calculation.
Be careful with your text editor. Likely not an issue in Linux
? but in Windows, I find I have to be careful as to ANSI or UTF-8 and all that.