A true story.
In 1969 I passed my exam and with a brand new mate's foreign going ticket got a job as second officer on a research ship.
We spent most of our time in the southern ocean so the ship was part of the NOAA weather reporting network-this of course before the days of weather satellites. The rear wall of the charthouse was covered with associated weather instruments-a spring mounted barograph so sensitive it would measure pressure variations as ship rose and fell over ocean swells, anemometers, thermometers for air and sea water temperatures etc. This information was encoded together with sea state conditions and the ships course and speed and transmitted via SSB to the nearest shore station every 4 hours by the watch officer.
So I got a brief explanation from the captain about what and how to do it all, in fact a very brief explanation, the sort of explanation a man gives to a person he assumes is smarter than they actually are.
In the middle of all this weather instrumentation was a little brass plate with the inscription 'Wind on Tuesday.' So of course I wondered what about the wind on Tuesday? Was there something special I needed to transmit on Tuesday? For days I worried about that sign and didn't want to ask and appear stupid.
And just as well as I finally realised that the little sign was directly over the gimballed box that housed the ship's chronometer.