1. Introduction
The Citizen Eco-Drive Promaster Land Altichron (Model: BN5058-07E) is a robust and innovative timepiece designed for adventurers. Featuring Citizen's Eco-Drive technology, it is powered by any light source, eliminating the need for battery replacement. This watch includes an altimeter, compass, and date function, making it an essential tool for outdoor enthusiasts.
This manual provides detailed instructions for setting up, operating, and maintaining your watch to ensure optimal performance and longevity.
2. Key Features
- Eco-Drive Technology: Powered by any light source, ensuring continuous operation without battery changes.
- Altimeter: Measures altitude from -1,000 feet to 32,000 feet.
- Electronic Compass: Provides directional guidance.
- Date Display: Convenient date window.
- Luminous Hands and Markers: Enhanced visibility in low-light conditions.
- Power Reserve Indicator: Displays the remaining charge level.
- Anti-Reflective Mineral Crystal: Improves readability by reducing glare.
- Water Resistance: Rated for 200 meters (660 feet), suitable for professional marine activity and serious surface water sports, but not scuba diving.
- Stainless Steel Case: Durable and stylish black ion-plated stainless steel case.
- Polyurethane Strap: Comfortable and bold black polyurethane strap.

Figure 1: Watch dial highlighting Altimeter, Electronic Compass, Luminous Hands and Markers, Power Reserve Indicator, Date, and Anti-Reflective Crystal.
3. Setup
3.1 Initial Charging
Your Eco-Drive watch is powered by light. Before initial use, or if the watch has stopped, expose it to bright light for several hours to ensure it is fully charged. The power reserve indicator will show the current charge level.
Video 1: Official Citizen Eco-Drive Video explaining the technology. This video demonstrates how the Eco-Drive system converts light into energy to power the watch.
3.2 Setting the Time and Date
Refer to the detailed instructions in the full user manual for precise time and date setting procedures, as these multi-function watches often require specific crown and button sequences.
4. Operating Your Watch
4.1 Timekeeping
The watch maintains accurate time with a precision of +/-15 seconds per month. The main hands display the current time, and the date is shown in the date window.
4.2 Altimeter Function
The altimeter measures altitude from -1,000 feet to 32,000 feet. It features an altimeter adjusting function of +/-300 (per 2.5 units). To activate and use the altimeter, consult the detailed instructions in the comprehensive user manual for specific button operations and calibration.
4.3 Electronic Compass
The electronic compass function provides directional readings. For accurate readings and calibration procedures, refer to the full user manual.
Video 2: Official Citizen Altichron video showcasing the watch's features, including the altimeter and compass functions in action.
4.4 Power Reserve Indicator
The power reserve indicator helps you monitor the watch's charge level. Ensure the watch is regularly exposed to light to maintain an adequate power reserve.
5. Maintenance and Care
5.1 Cleaning
Wipe the watch case and strap regularly with a soft, dry cloth to remove dirt and perspiration. For the polyurethane strap, a mild soap solution and water can be used, followed by thorough rinsing and drying.
5.2 Water Resistance
The watch is water resistant to 200 meters. Ensure the crown is fully pushed in before exposing the watch to water. Avoid operating the crown or buttons while the watch is wet or submerged to prevent water intrusion.
5.3 Light Exposure
To maintain optimal performance of the Eco-Drive movement, regularly expose your watch to light. Avoid prolonged storage in dark places.

Figure 2: Side view of the watch, showing the crown and case profile. The crown must be fully pushed in for water resistance.
6. Troubleshooting
- Watch has stopped or is running irregularly: The watch may not be sufficiently charged. Expose it to bright light for several hours.
- Time or date is incorrect: Refer to the detailed setting instructions in the full user manual to reset the time and date.
- Altimeter or compass readings are inaccurate: These functions may require calibration. Follow the calibration steps outlined in the comprehensive user manual.
- Condensation inside the crystal: This may indicate a loss of water resistance. Contact Citizen customer service for inspection and repair.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | BN5058-07E |
| Movement | Eco-Drive (Solar Powered Quartz) Caliber J290 |
| Case Material | Black Ion-Plated Stainless Steel |
| Case Diameter | 4.72 inches (approx. 46mm) |
| Crystal | Anti-Reflective Mineral Crystal |
| Strap Material | Black Polyurethane |
| Water Resistance | 200 Meters (660 feet) |
| Altimeter Range | 1,000ft - 32,000ft |
| Accuracy | +/-15 seconds per month |
| Special Features | Electronic Compass, Power Reserve Indicator, Date |
8. Warranty and Support
This Citizen watch comes with a 5-Year Limited Warranty. For detailed warranty terms, service, or support, please refer to the official Citizen website or contact their customer service directly. Extended protection plans may also be available for purchase.
For additional information or assistance, please visit the Citizen Store on Amazon.