Spinnaker SP-5081
Spinnaker Dumas SP-5081 Automatic Dive Watch User Manual
Model: SP-5081
1. Introduction
Thank you for choosing the Spinnaker Dumas SP-5081 Automatic Dive Watch. This timepiece is engineered for reliability and durability, featuring a robust design suitable for both daily wear and underwater activities. This manual provides essential information for the proper setup, operation, and maintenance of your watch.

Image 1.1: Front view of the Spinnaker Dumas SP-5081 Automatic Dive Watch.
2. Setup and Initial Operation
2.1 Initial Winding
Your Spinnaker Dumas watch is powered by an automatic mechanical movement (Seiko NH35). It winds itself through the motion of your wrist. If the watch has stopped or has not been worn for an extended period, it may require manual winding to initiate operation.
- Ensure the crown is in the fully pushed-in and screwed-down position.
- Unscrew the crown by turning it counter-clockwise until it springs out to position 0.
- In position 0, turn the crown clockwise approximately 20-30 times. This will provide sufficient power reserve to start the watch.
- Push the crown back in and screw it down tightly to maintain water resistance.
2.2 Setting the Time and Date
To set the time and date, follow these steps:
- Unscrew the crown (position 0).
- Setting the Date: Gently pull the crown out to position 1. Turn the crown clockwise or counter-clockwise (depending on the movement) until the correct date is displayed. Avoid setting the date between 9 PM and 3 AM, as this can damage the movement. If the current time falls within this window, first set the time outside this range, then set the date, and finally reset the correct time.
- Setting the Time: Pull the crown out further to position 2. The second hand will stop. Turn the crown to set the hour and minute hands. To ensure accurate AM/PM setting, advance the hands past 12 o'clock; if the date changes, it is midnight (AM). Continue to set the correct time.
- Once the time and date are set, push the crown back into position 0 and screw it down tightly to ensure water resistance.

Image 2.1: The watch crown, used for winding and setting time/date.
3. Operating Your Dive Watch
3.1 Automatic Movement
Your watch is powered by an automatic movement, meaning it does not require a battery. It gains power from the natural motion of your wrist. When fully wound, it has a power reserve of approximately 40 hours. If the watch is not worn for an extended period, it will stop and need to be manually wound as described in Section 2.1.
3.2 Unidirectional Rotating Bezel
The Spinnaker Dumas features a unidirectional rotating bezel, a crucial tool for divers to measure elapsed time underwater. It rotates only counter-clockwise to prevent accidental increases in recorded dive time, thus enhancing safety.
- Before a dive, align the triangle marker (or 0-minute mark) on the bezel with the minute hand.
- As time passes, the minute hand will move, indicating the elapsed time against the bezel's scale.
- The bezel can also be used for timing other events, such as parking meters or cooking, by aligning the desired end time with the minute hand.

Image 3.1: The unidirectional rotating bezel, essential for dive timing.
3.3 Water Resistance (300m / 1000ft)
This watch is water resistant to 300 meters (30 ATM), making it suitable for professional marine activity and serious surface water sports, but not saturation diving. The screw-down crown is vital for maintaining this water resistance. Always ensure the crown is fully screwed down before exposing the watch to water.

Image 3.2: Luminous elements on the dial for visibility in low-light conditions, including underwater.
4. Care and Maintenance
4.1 Cleaning Your Watch
To maintain the appearance and longevity of your watch:
- After exposure to saltwater, rinse the watch thoroughly with fresh water and dry it with a soft cloth.
- For general cleaning, use a soft, damp cloth to wipe the case and bracelet. Avoid harsh chemicals or abrasive materials.
- For the stainless steel bracelet, a soft brush (like a toothbrush) can be used with mild soap and water to clean between links. Rinse thoroughly.
4.2 Water Resistance Precautions
- Always ensure the crown is fully screwed down before any contact with water.
- Do not operate the crown or pushers (if applicable) while the watch is wet or submerged.
- Avoid exposing the watch to extreme temperature changes (e.g., hot shower immediately followed by cold water), as this can affect the seals.
- It is recommended to have the water resistance seals checked by an authorized service center every 2-3 years, especially if the watch is frequently used for diving.
4.3 Storage
When not wearing your watch, store it in a cool, dry place away from direct sunlight and strong magnetic fields, which can affect the accuracy of mechanical movements.

Image 4.1: The exhibition case back, revealing the automatic movement.
5. Troubleshooting
If you encounter any issues with your Spinnaker Dumas watch, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch has stopped or is running slow. | Insufficient power reserve. | Manually wind the watch (Section 2.1) and wear it regularly. |
| Date changes at noon instead of midnight. | AM/PM setting incorrect. | Advance the time by 12 hours (Section 2.2). |
| Condensation under the crystal. | Water ingress or extreme temperature change. | Immediately take the watch to an authorized service center. Do not attempt to dry it yourself. |
| Crown cannot be screwed down. | Cross-threaded or debris in threads. | Gently try to re-engage threads. If resistance persists, do not force it. Seek professional assistance. |
For issues not listed here or if solutions do not resolve the problem, please contact Spinnaker customer support or an authorized service center.
6. Specifications
- Model Number: SP-5081
- Movement: Seiko NH35 Automatic
- Case Material: 316L Stainless Steel
- Case Diameter: 44mm
- Crystal: Sapphire with Anti-Reflective Coating
- Water Resistance: 300 meters (30 ATM / 1000 feet)
- Crown: Screw-down
- Bezel: Unidirectional Rotating Dive Bezel
- Strap: Stainless Steel Bracelet (additional rubber strap included)
- Lume: Super-LumiNova on hands and markers
- Functions: Hours, Minutes, Seconds, Date
- Package Dimensions: 4.72 x 3.94 x 3.54 inches
- Item Weight: 7.05 ounces
7. Warranty and Support
Your Spinnaker Dumas SP-5081 watch is covered by a manufacturer's warranty against defects in materials and workmanship. Please refer to the warranty card included with your purchase for specific terms, conditions, and duration. For warranty claims, service, or technical support, please contact Spinnaker customer service through their official website or an authorized dealer.
Note: Damage resulting from improper use, neglect, unauthorized repairs, or failure to follow the instructions in this manual may void your warranty.
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.







