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CONTENTS
Complete User Guide
8X42 GPS SOLAR WATCH (Big-Date)

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Handling Cautions
Warning: Serious Injury Risks
Risks of serious consequences such as severe injuries unless safety regulations are observed.
Cautions: Minor Injury and Damage Risks
Risks of light injuries or material damages unless safety regulations are observed.
Watch Features Overview
GPS Solar Watch Capabilities
Explains the watch's GPS solar functionality including signal reception, solar charging, and auto time adjustment.
GPS Time and Date Setting Mechanism
GPS Satellite System Explained
Details the US Department of Defense NAVSTAR satellite system and its atomic clock.
Watch Time and Date Synchronization
How the watch receives GPS signals for precise time and date based on atomic clock and time zone data.
Understanding Time Zones
Time Zone Definition and Structure
Explains time zones based on UTC, country/region adoption, and 39 zones.
Daylight Saving Time (DST) Explained
Details DST as a system to lengthen daylight by advancing time, common in Europe/North America.
Coordinated Universal Time (UTC) Definition
Explains UTC as universal standard time coordinated internationally, based on atomic clock.
Key Watch Functions
Time Zone Change Functionality
How to adjust the time zone for precise local time when traveling or changing regions.
Manual Time Setting Function
How to manually adjust the time for the set time zone using manual time adjustment.
Before Using Your Watch
Watch Components Identification
Identifies and labels the various parts of the watch, including hands, dials, crown, and buttons.
Indicator and Reception Display Guide
Receiving Process Indicator Display
Shows how the indicator hand displays the status of GPS signal reception and leap second data.
In-flight Mode Indicator Display
Displays the in-flight mode status and how it affects the indicator hand.
Watch Charging Status Indicator
Illustrates how the indicator hand shows the watch's charging status (full, middle, low).
Daylight Saving Time (DST) Indicator
Shows how the indicator hand displays the DST ON/OFF setting.
Global Time Zone Reference
Time Zone Display Information
Details the display of 28 representative cities across 39 time zones and their differences from UTC.
Time Difference Chart
Lists city codes, names, and UTC time differences, including DST considerations.
Watch Charging Guide
How to Charge the Watch
Instructions on exposing the dial to light to charge the watch for optimal performance.
Standard Charging Time Estimates
Provides estimated charging times based on illumination levels for full charge and operation.
Basic Operation: Time and GPS Signals
Basic Operation Flowchart
Outlines the step-by-step process for checking GPS signal reception and setting time/date.
GPS Signal Reception Locations
Describes environments conducive to GPS signal reception versus those that obstruct it.
Time Zone Adjustment Procedures
GPS Time Zone Localization
How to adjust the watch to the precise current time using one-button operation anywhere globally.
Time Zone Adjustment Precautions
Advises on potential issues near time zone boundaries and how to handle them manually.
Step-by-Step Time Zone Adjustment
Step 1: Ensure Good GPS Signal Reception
Move to an open sky location for optimal GPS signal reception for time adjustment.
Step 2: Initiate Time Zone Reception
Press Button A to start the reception process, indicated by the second hand moving.
Step 3: Wait for Signal Acquisition
Direct the watch upward and wait for signal acquisition, which may take up to 2 minutes.
Step 4: Check Reception Result and Time Update
Verify reception success (Y/N) and confirm time/date adjustment.
Enabling Daylight Saving Time (DST)
Step 1: Access DST Setting
Pull the crown to the first click to indicate the current DST setting.
Step 2: Activate DST
Press Button A to set DST to ON, advancing the hour and minute hands by one hour.
Step 3: Confirm DST Setting
Push the crown back in to return to time display mode and confirm the DST status.
Sub-dial DST Setting
Step 1: Access Sub-dial DST Setting
Pull the crown to indicate current DST setting and time zone.
Step 2: Select Sub-dial Time Zone
Press Button B to display the currently set time zone of the sub-dial.
Step 3: Set Sub-dial DST to ON
Press Button A to set DST to ON, advancing hands by one hour.
Step 4: Confirm Sub-dial DST Setting
Push crown back to display charging status and confirm DST setting.
Verifying Time Zone and DST Settings
Step 1: Access Setting Verification
Pull crown to first click to view DST setting and time zone.
Step 2: View Set Time Zone
Press Button B to display the currently set time zone of the sub-dial.
Step 3: Return to Time Display
Push crown back to return to time display mode and confirm settings.
In-Flight Mode Operation
Setting In-Flight Mode
How to set the in-flight mode to prevent interference with aircraft electronics.
Resetting In-Flight Mode
Procedure to reset the in-flight mode after use, restoring normal functionality.
Manual Time Zone Setting for Travel
Manual Time Zone Adjustment Process
How to manually set the time zone when GPS adjustment is not possible, referencing global time zones.
Step-by-Step Manual Time Zone Setting
Detailed steps for manually adjusting the second hand to the correct time zone.
Sub-dial Manual Time Zone Adjustment
Sub-dial Manual Time Zone Setting Steps
Guide on adjusting the sub-dial to select the correct time zone, synchronized with the main-dial.
Manual Time Adjustment
Manual Time Adjustment Function
How to set the precise current time of the currently set time zone without changing the time zone.
Step-by-Step Manual Time Adjustment
Step 1: Ensure GPS Signal Availability
Move to an open area with good visibility for reliable GPS signal reception.
Step 2: Initiate Manual Time Reception
Press Button A to start the reception process, indicated by the second hand.
Step 3: Wait for Time Signal
Direct the watch upward and wait for signal reception, which takes up to one minute.
Step 4: Confirm Manual Time Update
Verify reception success (Y/N) and confirm time/date adjustment.
Automatic Time Adjustment
Automatic GPS Time Synchronization
How the watch automatically adjusts time by receiving GPS signals when exposed to light outdoors.
GPS Signal Reception Types
Time Adjustment via GPS Reception
Explains GPS reception for manual and automatic time adjustments based on signal acquisition.
Time Zone Adjustment via GPS Reception
Explains GPS reception for identifying and adjusting to the correct time zone.
Leap Second Data Reception
Explains reception of leap second data for accurate timekeeping.
Leap Second Data Handling
Automatic Leap Second Reception
How the watch automatically adds leap seconds by receiving data from GPS signals.
Checking GPS Reception Success
Step 1: Initiate Reception Check
Press Button A to display the reception result (success/failure) for the last GPS signal reception.
Step 2: Interpret Reception Results
Understand the meaning of the second hand and indicator hand displays for reception success/failure and method.
Troubleshooting Second Hand Movement
Second Hand Movement States
Explains how second hand movement indicates watch functions and energy status.
Low Energy Second Hand Movement
Describes 2-second and 5-second interval movements indicating low energy and solutions.
Power Save Function: Second Hand Stops
Power Save Mode 1 Explained
Details the state, cause, and solution for Power Save 1 where the second hand stops at 15-second position.
Power Save Mode 2 Explained
Details the state, cause, and solution for Power Save 2 where the second hand stops at 45-second position.
Preserving Watch Quality
Daily Watch Care Instructions
Provides guidelines for cleaning and maintaining the watch for daily use.
Watch Performance and Identification
Explains where to find the watch's performance specifications and caliber/case number on the case back.
Understanding Water Resistance
Water Resistance Ratings and Use
Details water resistant performance levels and their suitability for different activities like diving.
Magnetic Resistance and Influence
Effects of Magnetic Fields on Watches
Explains how magnetism can affect watch operation and provides precautions and reasons for magnetism effects.
Watch Band Care and Types
Metallic Band Care Guidelines
Instructions for cleaning and maintaining metallic bands to prevent rust and damage.
Leather Band Care Guidelines
Care instructions for leather bands, including protection from moisture and sunlight.
Polyurethane Band Care Guidelines
Care instructions for polyurethane bands, including susceptibility to discoloration and deterioration.
Silicone Band Care Guidelines
Care instructions for silicone bands, noting their tendency to get dirty and crack.
Adjustable Clasp Usage
Wearing and Removing the Watch
Step-by-step guide on how to operate the three-fold clasp to wear or remove the watch.
Adjusting Band Length
Instructions on how to adjust the length of the watch band using the clasp's adjustment holes.
Lumibrite Luminous Paint
Lumibrite Functionality Explained
Describes Lumibrite as a luminous paint that absorbs and emits light, with data on luminance and duration.
Watch Power Source Details
Secondary Battery Replacement Notes
Advises against self-replacement of the secondary battery and warns about using ordinary silver oxide batteries.
Overcharge Prevention Function
Details the automatic function that prevents overcharging of the secondary battery.
After-Sales Service Information
Guarantee and Repair Guidelines
Information on contacting retailers for repair, presenting the guarantee certificate, and post-guarantee service.
Replacement Parts Policy
Notes that original parts may be unavailable and substitutes might be used.
Periodic Inspection and Overhaul
Recommends periodic inspection and cleaning (every 3-4 years) to maintain performance and water resistance.
Troubleshooting Watch Issues
Troubleshooting: No GPS Signal Reception
Identifies causes and solutions for the watch failing to receive GPS signals.
Manual Time Setting When No GPS Signal
How to manually set the time when the watch cannot receive GPS signals or experiences time gain/loss.
Manual Time Setting Procedure
Step 1: Access Manual Time Setting Mode
Pull the crown to the second click to stop the second hand and enter manual time setting mode.
Step 2: Activate Manual Time Setting
Press Button B to stop the second hand at the 0-second position, entering the mode.
Step 3: Adjust Time with Crown
Turn the crown clockwise or counterclockwise to adjust the time accurately.
Step 4: Finalize Time Setting
Push the crown back in to resume normal movement and complete the time setting.
Troubleshooting Hand and Dial Misalignment
Initial Checks for Hand Misalignment
Checks for time zone, DST, and automatic time adjustment function activation as potential causes.
Understanding Preliminary Position
Explains that misalignment can occur due to external factors like impact or magnetism.
Automatic Hand Position Adjustment
Describes the automatic function that corrects preliminary positions of hour, minute, and second hands.
Manual Sub-dial, Date, Indicator Hand Adjustment
Details the manual process for adjusting the preliminary positions of the sub-dial, date, and indicator hand.
Watch's Default Preliminary Positions
Procedure: Adjusting Preliminary Positions
Step-by-step guide to adjust sub-dial, date, indicator hand, and hour/minute hands.
Managing Light Detection Setting
Canceling Light Detection
How to disable the light detection function, which alters automatic time adjustment settings.
Enabling Light Detection
Procedure to turn the light detection function back on, adjusting the second hand to the ON position.
Comprehensive Troubleshooting Guide
Troubleshooting Hand Movements
Addresses issues like second hand moving at 2/5-second intervals, stopping, or rapid advancement.
Troubleshooting GPS Signal Reception
Troubleshooting: Reception Not Starting
Solutions for when the watch fails to start GPS signal reception for time or zone adjustment.
Troubleshooting: Reception Failure (Result 'N')
Steps to take when GPS signals are received but the result is 'N' (failed).
Troubleshooting: No GPS Signals Received
Solutions when GPS signals cannot be received even after attempting reception.
Troubleshooting Time and Date Accuracy
Troubleshooting: Time Drift After Successful Reception
Addresses time gain/loss after successful GPS reception, checking time zone and DST settings.
Troubleshooting: Minor Time Deviation
Solutions for slight time deviations after successful reception, including hand alignment checks.
Troubleshooting: Auto Time Adjustment Inactive
Explains why automatic time adjustment might be inactive and how to address it.
Troubleshooting: Automatic Reception Failure
Addresses why automatic reception might not be activated and how to enable it.
Troubleshooting Misalignment and Operation Issues
Troubleshooting: Misaligned Reception Indicators
Solutions for misaligned second hand indicating reception results or satellite count.
Troubleshooting: Temporary Time Gain/Loss
Addresses time gain/loss due to external factors or temperature, with solutions.
Troubleshooting Battery and Date Issues
Troubleshooting: Solar Battery Charging
Addresses issues with the solar battery not resuming normal movement after charging.
Troubleshooting: Incorrect Date Alignment
Solutions for incorrect date display after successful reception, indicating preliminary position misalignment.
Troubleshooting: Sub-dial Adjustment Failure
Solutions for inability to adjust the sub-dial, indicating preliminary position misalignment.
Troubleshooting Indicator and Operation Problems
Troubleshooting: Indicator Hand Misalignment
Solutions for misaligned indicator hand showing reception, charging status, or DST.
Troubleshooting: Operation Interruption
Addresses issues like getting lost mid-operation or buttons/crown becoming unresponsive.
Troubleshooting: Dial Glass Blurriness
Addresses persistent blurriness on the dial glass, possibly due to gasket issues.
Function List and Specifications
Functions for Time Adjustment
Lists and briefly describes functions related to GPS signal reception, time zone, and manual time adjustment.
Functions for Watch Charging
Lists and briefly describes solar charging, charging status display, and power save functions.
GPS Signal Reception Functions
In-flight Mode Functionality
Function to prevent GPS signal reception when boarding an airplane.
Satellite Acquisition Status Display
Displays the number of GPS satellites received during signal reception.
Reception Result Display Function
Displays the latest reception result (success/failure).
Time Zone Setting Check Function
Displays the currently set time zone.
Other Key Watch Functions
Lists dual time display, hand position alignment, and leap second reception functions.
Watch Specifications
Basic Watch Functions
Lists main-dial functions, date, indicator hand, dual time display, 24-hour display, and world time.
Crystal Oscillator Frequency
Specifies the frequency of the crystal oscillator used in the watch.
Monthly Time Accuracy Rate
Details the monthly loss or gain rate of the watch under specific conditions.
Operational Temperature Range
Specifies the temperature range within which the watch can operate normally.
Watch Driving System
Describes the watch's driving system, including motors and calendar displays.
Watch Power Source
Identifies the power source as a secondary battery.
Watch Duration of Operation
Details the duration of operation on a full charge and with Power Save activated.
GPS Signal Reception Capabilities
Lists the GPS functions including time zone adjustment and automatic time adjustment.
Integrated Circuit (IC) Details
Specifies the type of integrated circuit used in the watch.

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