almost a technocrat

This table provides a list of countries along with their ISO 3166-1 alpha-2 country codes and corresponding GMT (Greenwich Mean Time) offsets. The GMT offset represents the time difference between the country's local time and Greenwich Mean Time, which serves as a reference point for global timekeeping.

In case when the thermometer and barometer readings are not accurate, this is how you can re-calibrate it.

Other than giving the readings of your current altitude and temperature in the Altimeter mode, you can set your own altitude value. This is a way where you can use it to set it to zero for referencing the height of a climb or as a re-calibration of the altitude reading.

This city codes are provided in the watch user manual but for the ease of references in the web, I put this table in this blog in case i wanted to refer to it using my smartphone. Hope you find this useful.

A pdf version of Casio SGW300HD-1AV watch user manual for easy reference.