Casio 2891

Operation Guide 2891
1
Your watch runs on electrical power generated from light and stored by a chargeable battery.
To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.
1. How the solar cell and battery work
When exposed to light
Light
Power supplied to watch
Solar cell
Electrical
energy
Charge
Recharge-
able battery
When not exposed to light
Power supplied to watch
Discharge
Recharge-
able battery
Your watch continues to operate, even when it is not exposed to
light. Leaving the watch in the dark can run down its battery and
cause functions to become disabled.
2. Avoid overuse of display illumination.
• Over use of display illumination can run down the battery.
Power supplied to watch
Discharge
Recharge-
able battery
The following shows approximately how much exposure to light is
required to recharge the battery by the amount used by one
display illumination operation.
• Sunlight through a window: 5 minutes
• Indoor fluorescent lighting: 50 minutes
Care is required when using the full auto light switch, which
can cause frequent display illumination.
Keep your watch exposed to light!
• You can also keep track of the current
barometric pressure and temperature
while climbing.
• See “Taking Pressure and
Temperature Readings” for more
information.
Recall altitude records from memory to retrace your climb
and to make plans for your next climb.
• See “Viewing Altitude Memory Records” for more
information.
. After you get back home...
Pressure Tendency Graph
Temperature
Pressure/Temperature Mode
Barometric
Pressure
Check changes in barometric pressure to get an idea of
what kind of weather to expect.
• See “Taking Pressure and Temperature Readings” for
more information.
. Before getting started...
Pressure Tendency Graph
Temperature
Pressure/Temperature Mode
Barometric
Pressure
Pressure
Differential
Graphic
Altitude Graph
Altitude
Current Time
Altitude Mode
Altitude
Differential
Graphic
Digital Compass
Current Time
Compass Mode
Direction
Angle
Using Your Watch for Mountain Climbing
Your watch has a number of built in sensors that allow you to take direction, altitude, barometric pressure,
and temperature readings while mountain climbing or hiking.
MA0509-EA
3. Tips on how to keep the battery charged.
• Try to ensure that the watch is always exposed to enough light to
keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the
watch’s functions are disabled when battery power drops to
LEVEL 3.
Light
Level 1
Level 2
Level 3
Level 4
Battery Indicator
Recharge-
able battery
All functions
enabled
Some
functions
disabled
• Whenever you are not wearing the watch on your wrist, position it
so the face (solar cell) is pointed in the direction of a source of
bright light.
Light
Solar Cell
Leave the watch under
fluorescent lighting, near a
window, etc.
• When wearing the watch, try to keep your sleeve from blocking its
face (solar cell).
Charging efficiency is significantly
reduced even if the face of the
watch is only partially covered by
your sleeve.
. After you start climbing...
• Monitor the altitude on the display to
see how high you have climbed. You
can also record altitude records
(including date and time) in memory.
• See “Taking Altitude Readings” for
more information.
• Use the digital compass to keep track
of your current bearing.
• See “Taking Direction Readings” for
more information.

Casio 2891 Specifications

General

Brand	Casio
Model	2891
Category	Watch
Language	English

Summary

Keep Your Watch Exposed to Light

How the Solar Cell and Battery Work

Explains the watch's power generation and storage mechanism.

Power Saving Features

How the Sleep State Works

Explains the watch's automatic sleep states to conserve battery power.

Power Supply and Charging

Battery Indicator Levels

Describes the five levels of battery charge and their implications.

Starting at Level 4

Advises immediate charging when the battery reaches Level 4.

Charging Precautions

Lists locations and conditions to avoid during charging.

How to Charge the Battery

Provides instructions on positioning the watch for optimal charging.

Illumination Features

Full Auto Light Switch

Details automatic illumination activation based on watch angle.

Radio-controlled Watch Operation

How a Radio-controlled Watch Works

Explains the process of receiving time calibration signals.

Receiving the Calibration Signal

Covers auto and manual signal reception procedures.

Calibration Signal Configuration and Troubleshooting

Configuring Auto Receive Settings

Steps to enable or disable automatic reception of time calibration signals.

Troubleshooting Signal Reception

Addresses common issues like inability to receive signals and time inaccuracies.

Calibration Signal Reception Precautions

Important notes regarding signal reception and watch settings.

Digital Compass Usage and Calibration

Taking Direction Readings

How to use the watch's magnetic sensor to determine direction.

Digital Compass Precautions

Key considerations for accurate direction readings.

Calibrating the Direction Sensor

Procedures for ensuring accurate compass readings.

2-Point Calibration Method

Detailed steps for performing 2-point calibration.

Northerly Calibration Method

Steps for calibrating to true north.

Digital Compass Operation Details

Performing 2-Point Calibration

Step-by-step guide for calibrating the compass using two points.

Performing Northerly Calibration

Step-by-step guide for calibrating to true north.

Using the Digital Compass

Explains how to use the compass for navigation and location finding.

Digital Compass Reference and Troubleshooting

Using the Compass in an Automobile

Instructions for calibrating the compass for use in vehicles.

Digital Compass Troubleshooting

Common issues and solutions for direction reading inaccuracies.

Taking Pressure and Temperature Readings

Barometric Pressure and Temperature Readings

Details on how readings are taken and displayed.

Interpreting the Pressure Tendency Graph

Sensor Calibration and Barometric Pressure Primer

Calibrating the Pressure Sensor

Steps to adjust the barometric pressure sensor reading.

Calibrating the Temperature Sensor

Steps to adjust the temperature sensor reading.

Predicting Weather with Barometric Pressure

Taking Altitude Readings

Altitude Readings Process

Altitude Alarm and Memory

Using the Altitude Alarm

Setting the Target Altitude

Altitude Memory Overview

Performing Altitude Recording

Altitude Memory Records and Settings

Viewing Altitude Memory Records

Setting a Reference Altitude

How to set a baseline altitude for accurate relative measurements.

Advanced Altitude Application and Stopwatch

Obtaining Absolute Altitude Readings

Method for setting a reference altitude for accurate measurements.

Altitude Reading Precautions

Sensor Error Detection

How the watch indicates and handles sensor malfunctions.

Using the Stopwatch

Using the Timer Function

Timer Types

Timer Alarms

Configuring Timer Settings

Steps to set the timer duration and type.

Using the Countdown Timer

Alarms, Hourly Time Signal, and World Time

Using Alarms and Hourly Time Signal

Setting an Alarm Time

Using World Time

Setting Home City Time and Date

To Configure Home City Settings

Steps to set the watch's primary time zone and date.