A fully sealed, solar-assisted, cellular GPS safety tracker built to live in salt water, sun and impact — with no ports and no way for water to get in. Here's exactly what's inside, what it does, and how it compares.
Epoxy-potted and sealed with no charging port and no buttons — the two places water usually gets in. Power on and off with a magnetic switch. Built for saltwater, sand, sun and impact.
Solar cells top up the battery through the day to extend autonomy between charges. In low-power modes under bright sun the panel offsets much of the draw, so the device keeps reporting for longer.
Because the case is fully sealed, it charges wirelessly — drop it on a pad, no exposed contacts, no flap to fail. One less way for the ocean to get in.
Prototype-validated architecture. Battery figures below are current measured pre-optimization values on deployed firmware; a power-optimization roadmap targets longer autonomy. Exact cellular bands are documented per deployment region.
The tracker trades battery for reporting frequency depending on the situation. Balanced is the everyday default; Live is for active sessions; Beacon and Sleep stretch autonomy for recovery and standby.
Second-by-second position for an active session. Uses more battery and data — session-only.
Standard tracking resolution for normal use. The recommended mode.
Slower reporting to conserve battery over a long day or storage.
Stationary or drifting-gear reporting to help find a lost board over a long window.
Scheduled sleep/wake for storage; lowest draw, approaches solar-neutral in bright sun.
Runs on the GT06 / Traccar protocol; commands issue from the SmartSurf platform. SOS Manager & AI-risk actions are on the firmware roadmap.
The tracker is built to become AI-driven: firmware and platform will let the device adapt its own reporting, flag risk, and act on Senlay's environmental context automatically — not just follow fixed rules.
The tracker sends its position over the mobile network using its built-in SIM. That's what lets it work without your phone — but it also means the honest truth about range: no towers, no signal. Here's exactly where it works, and where the next generation fills the gap.
A future dual-radio device adds LoRa — a long-range, low-power radio that talks directly to a local base station on the beach instead of a cellular tower. That means coverage at spots with no mobile network at all, and reach further offshore, independent of the phone grid.
A school or remote spot runs its own SmartSurfTab base station; devices fall back to LoRa where cellular can't reach. Cellular stays the default where it works; LoRa fills the empty coast. This is a roadmap direction, not a current-product claim.
Most trackers were built for cities, cars, or crowds. SmartSurf is built for the specific reality of water sports: empty water, offshore drift, salt, and the gap between "where" and "is the rider OK".
| CAPABILITY | SmartSurf | AirTag / Find My | WOO / perf trackers | Garmin / inReach | DIY / cheap GPS |
|---|---|---|---|---|---|
| Works on empty water (no crowd/phone nearby) | ✓ | ✕ | ~ | ✓ | ~ |
| Fully sealed, portless, saltwater-ready | ✓ | ~ | ~ | ~ | ✕ |
| Solar-assisted + wireless charging | ✓ | ✕ | ✕ | ✕ | ✕ |
| Paired rider + board separation logic | ✓ | ✕ | ✕ | ✕ | ✕ |
| Environmental AI context (wind/current/drift) | ✓ | ✕ | ✕ | ✕ | ✕ |
| School dashboard & fleet workflow | ✓ | ✕ | ✕ | ~ | ✕ |
| Lifetime connectivity cost | ~$15 / 10 yr | n/a | subscription | monthly sat plan | SIM varies |
✓ built for it · ~ partial / depends · ✕ not designed for it. Comparison reflects typical use for water-sports safety, not every product variant.
Yes. The electronics are epoxy-potted inside a sealed case with no charging port and no mechanical buttons — the two places water normally gets in. It powers on and off with a magnet and charges wirelessly, so nothing has to open. It's designed to be fully submersible in salt water.
No. The tracker has its own cellular connection and GPS. It reports directly — you don't carry a phone, and it doesn't rely on other people's phones nearby the way an AirTag does. A phone app is coming as an optional budget/backup rider mode.
It depends on mode: roughly 7–8 h in Live, 10–15 h in Balanced (the default), ~30 h in Eco, ~2 days in Beacon, and ~4 days in Sleep, on the 1500 mAh cell. Dual-solar tops it up through the day. These are current measured figures before power optimization, which targets longer runtimes.
Wirelessly — set it on a charging pad. There's no port or cover to wear out or leak. Solar assist extends the time between charges.
It uses an embedded 1NCE IoT SIM: about $15 for 10 years across 150+ countries, including 500 MB of data. Coverage depends on local cellular networks. High-frequency Live mode uses more data, so it's meant for active sessions rather than running all day.
The device buffers its fixes offline and sends them once it's back in coverage, so the track isn't lost. For remote spots without cellular, a future LoRa local network is on the roadmap.
One on the board recovers lost gear. The real safety value is a pair: one on the board, one on the rider, so the system can detect separation and know the person is safe — not just where the equipment drifted.
No. SmartSurf is assistive safety technology. Manual SOS and alerts notify your trusted contacts, school, or an opt-in local safety network — it does not replace official rescue services, a leash, or required safety equipment.
I'm building the first small batch by hand. Register interest so I can plan it — or just ask me anything about the hardware directly. Nothing is sold here; buying happens in a private conversation.