I did some maths this afternoon, and as a result came out the theoretical clockwork of the stopwatch. I put it in an excel file.
Left side you have the seconds, in the title line there ist the shiplength and in the middle the resulting speed of the ship.
You can download it from the filefront link.
Three Versions are available.
This one is mathematically correct it equals 1 mile with 1,852 km
http://files.filefront.com/Speed1knt.../fileinfo.html
This one is historically correct because the template
http://www.subsim.com/radioroom/show...7&postcount=75 shows the same behaviour, it equals 1 mile with 2km
http://files.filefront.com/Speed1knt.../fileinfo.html
The third on is something in between and should give equal results to the SH III chrono reading.
http://files.filefront.com/Speed+U+J.../fileinfo.html
It is not known why the original chrono shows this rounding.
The chrono is running a little bit faster, thus indicating a little less speed.
The ship moves a little bit faster as the chrono tells us.
Hmmm ...
Wouldn`t it be better the other way round ?
Anyway enyoy !