Hey SunTiger, sounds like you are tracking the watches just like me
'time.is' is my reference point, first I manually wind the watch up (fully) then wear the watch whole week and check the gain/loss 3 times per day, I do my best to do the check at the same/very similar hours, every 8 hours let's say.
For the night I put the watch crown up, or crown down of face up.
Then I put it into a spreadsheet and calculate delta(1) which is delta between 3 daily checks, and also delta(2) which is focused only on the night results when watch is resting in a various positions.
I think this is the simplest method to do your
homemade-COSC-light test (temperature and atmospheric pressure I don't care).
No, it is not a general rule, all depends on the watch/movement how it reacts to a various position, have a look here please;
This is my very consistent aka boring as hell watch which does not care much about the positions;
View attachment 1010775
and here is the watch which does not like resting in "crown down" position.
View attachment 1010774
It is probably each to their own. Some put a watch on a timegrapher, others will use apps to track the accuracy, I am not a fan of those apps as they measure an average between the days/test results, that's kinda funny method me thinks. Some other people will log the accuracy in the own tests.
As you are already on your own log, do consider checking a delta between the various horizontal&vertical positions
Have fun!
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