Altimeter, Barometer; Tide Graph (Graphic Display Of Tide Information) - Casio WSD-F21HR User Manual

Altimeter, Barometer

The watch's Altimeter uses a pressure sensor to measure barometric
pressure, and then calculates and displays relative altitude based on the
measured value. Because of this, readings taken at different times at the
same location may produce different altitude values due to changes in
temperature, humidity, barometric pressure, and other factors. Also note that
values displayed by the watch may be different from elevations indicated for
areas where you are located. When using the watch's altimeter while
mountain climbing, it is recommended that you perform regular correction in
accordance with the local altitude (elevation) indications.

Tide Graph (Graphic Display of Tide Information)

The Tide Graph feature of your watch is intended to provide a rough image
of current tide conditions. Do not use its tide information for navigation
purposes. For navigation purposes, be sure to use official tide charts issued
by a reliable agency or authority for the area you are navigating.
EN-7