The BALL Roadmaster Ocean Explorer pairs moon-phase and tide indications with a COSC-certified automatic movement, 100 m water resistance, and a 41 mm steel case. Its nautical functions give the watch a distinct purpose and look; the published specifications make it a capable-feeling sports-watch proposition on paper, though they do not establish how accurately its tide display works or which activities its water-resistance rating suits.
What the Ocean Explorer’s nautical features do
BALL lists a moon phase, a high/low tide indication, and a spring/neap tide strength indication alongside the usual hours, minutes, seconds, and date. Together, these complications make the Ocean Explorer more than a standard three-hand sports watch: they put lunar and tidal information on the dial as part of its nautical character.
The Japanese product pages do not explain how to set the tide mechanism, how local geography affects its reading, or its precision. They also do not establish that it can replace local tide tables. Anyone relying on tide information for boating, swimming, or other safety decisions should use an authoritative local source rather than assume the watch is a substitute.
Movement, case, and performance specifications
BALL specifies an automatic RR1803-C movement and Swiss COSC chronometer certification. The case is 316L stainless steel, with an aluminum-top bidirectional rotating bezel, anti-reflective sapphire crystal, screw-down crown, transparent caseback, and a matching 316L steel bracelet.
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- DG3030B-S6CJ-WH
- Chronometer
- Luminous Dial
- GMT
- Rotating Bezel
| Specification | BALL’s published detail |
|---|---|
| Bezel diameter | 41 mm |
| Thickness | 12.95 mm |
| Weight | Approximately 190 g |
| Water resistance | 100 m |
| Shock resistance | 5,000 G |
| Anti-magnetism | 4,800 A/m |
| Movement | Automatic RR1803-C; Swiss COSC-certified chronometer |
| Bracelet | 316L stainless steel |
These are manufacturer-published specifications, not independent test results or an activity guarantee. The 100 m rating is a stated resistance figure; it should not be stretched into a claim about suitability for a particular water sport. BALL’s product pages do not state a power reserve. A June 5, 2023 Time+Tide Watches video description reports 38 hours, but that is secondary, launch-era information rather than a figure confirmed in the Japanese listings.
Dial colors, price, and limited-edition status
BALL Watch Japan lists two references: blue dial DM3120C-SCJ-BE and black dial DM3120C-S1CJ-BK. Each Japanese listing shows a tax-inclusive price of ¥572,000 and describes the reference as limited to 1,000 pieces worldwide. These are Japan-specific page prices and manufacturer edition statements, not evidence of current stock or remaining production.
Rank #2
- DG3030B-S3C-BR
- Chronometer
- GMT
- Day/Date
- Water Resistant
Time+Tide Watches’ June 5, 2023 video description reported blue, black, and green launch colors and a US$3,299 launch-era price. That account also described the initial offer as 1,000 pieces per color. The Japanese official listings reviewed here establish blue and black references only; the older dollar price should not be treated as a current or global price.
Size and everyday wear considerations
At 41 mm across the bezel and 12.95 mm thick, the Ocean Explorer has dimensions that may work for a range of wrists, but its listed approximate weight of 190 g makes it a substantial steel watch on its bracelet. The published figure is for the watch with bracelet, and individual comfort will depend on wrist size and fit. Time+Tide reports a 48.5 mm case length and 20 mm lug width; those dimensions are secondary-source details not confirmed in the Japanese product excerpts.
Rank #3
- DD3072B-P1CJ-BK
- Chronometer
- Date
- Sapphire Crystal
- Rotating Bezel
For low-light legibility, BALL says the dial and hands use 29 self-illuminating micro gas lights. This is a stated design feature, not a hands-on assessment of brightness or duration. The combination of a rotating bezel, screw-down crown, sapphire crystal, and steel bracelet gives the specification sheet a familiar sports-watch foundation, while the tide and moon displays supply the more distinctive nautical identity.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who should consider the Roadmaster Ocean Explorer?
- It may suit you if you like mechanical watches with unusual nautical complications, prefer a steel bracelet, and value the COSC certification and manufacturer-listed resistance specifications.
- Consider carefully if you want a lighter watch, need verified tide readings for a specific location, or expect the complication to replace local tide information. The product pages do not explain setup or accuracy.
- Check before buying the reference, price, and availability with BALL or a seller in your market. Limited-edition labeling does not confirm that a particular watch is in stock.
For reference details, BALL’s Japanese listings are available for the blue DM3120C-SCJ-BE and black DM3120C-S1CJ-BK. Time+Tide’s launch-era details appear in its June 5, 2023 video description.
Quick Recap
Rank #4
- DG3038A-S1C-BE
- GMT
- Luminous Dial
- Chronometer
- Rotating Bezel
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
