Measurement Functions; Compass (Bearing Measurement) - Casio WSD-F21HR User Manual

Measurement Functions

Your watch can take barometric pressure, altitude, bearing, and other
readings. Its built-in watch faces and applications can use readings for display
and other useful functions. Note that this watch is not a special purpose
measuring instrument. Readings produced by measurement functions are
intended as general reference information only.

Compass (Bearing Measurement)

For serious mountain climbing and other activities that require accurate
bearing readings, take along a highly reliable compass to use in combination
with the watch's compass.
Important!
Note that accurate compass readings and/or correction will not be possible
●
in the areas described below.
In the vicinity of a permanent magnet (magnetic accessory, etc.), metal
ー
objects, high-voltage wires, aerial wires, or electrical household
appliances (TV, computer, cellphone, etc.)
On trains, on boats, on aircraft, etc.
ー
Indoors, especially inside of reinforced concrete structures.
ー
EN-6