Casio WSD-F20X User Manual page 52

Monochrome Display (WF/TP)
Operation
Each tap of this setting item toggles the face background between "Dark" and
"Bright".
Description
You can select how the watch's monochrome LCD displays data. This setting
is applied to all of the displays below.
"2 Layers" watch face monochrome display
●
TOOL app monochrome display
●
Timepiece Mode monochrome display
●
GPS Time Calibration (WSD-F20 series only) (WF)
Operation
1. Move to an outdoor area where the sky is visible.
2. Perform the required operation on a CASIO watch face to display the
setting menu, and then tap "GPS Time Calibration".
3. Carefully read the message that appears on the display and then tap
"Correct".
4. Wait until GPS reception is complete.
Description
The watch normally adjusts its current time setting by syncing with a
smartphone. Should the smartphone battery go dead, if you lose your
smartphone, or if syncing is not possible for some other reason, you need to
perform the above operation each time you want to adjust the watch's time
setting. Each time you do, the watch will temporarily adjust its time setting
based on GPS information.
It is recommended that you perform this procedure in a location where GPS
reception conditions are good and where the sky is visible. See
and Inappropriate Signal Reception
Units (WF/TL/AC/MS)
Operation
Each tap of this setting item toggles between "Metric" and "Imperial".
Description
Use this setting to switch between metric units (meters, kilograms, hPa, etc.)
and Imperial units (feet, pounds, inHg, etc.) for values displayed by CASIO
watch faces and apps.
Location".
EN-51
"Appropriate