Dive planning, grounded in real data.#
TideTracker is a tide and current planning tool for divers in Puget Sound and the Strait of Juan de Fuca. Built around NOAA predictions, corrected with local diver observations, and designed to be readable at 5 a.m. before you leave the house.
Currently in beta. Free to join.
The problem#
Generic tide apps weren't built for the places we dive. Narrow passages, deep basins, and shifting haloclines make the Salish Sea one of the harder environments in the world to predict accurately. NOAA publishes solid reference data, but most dive sites sit on subordinate stations with offsets that can be decades old — and picking the right station out of dozens of nearby options is its own problem.
The result is familiar to anyone who dives here: predictions that are usually close, sometimes excellent, and occasionally off by enough to matter. At a site with real current, "off by enough to matter" stops being an inconvenience and starts being a safety issue.
What TideTracker does#
- Site-specific tide and current predictions for dive sites across Puget Sound and the Strait, drawn directly from NOAA CO-OPS endpoints.
- Transparent correction engine that refines subordinate-station predictions using diver-submitted observations. Every metric in every briefing is tagged with the NOAA station it came from, and every site shows the confidence and recency of its corrections.
- Readable at a glance. Charts, badges, and a calendar-based day-rating system built for pre-dawn, pre-coffee planning.
- Built around the community that uses it. Reports from divers who know their sites feed the corrections that everyone else sees.
How it works#
Every prediction in the app starts as a NOAA pull. For subordinate stations — which cover most dive sites — TideTracker applies the published offset, then layers a correction derived from user observations through an IQR-filtered model. The original NOAA number, the offset, and the applied correction are all surfaced in the UI: each metric shows its source station, each site shows its confidence tier (based on how many diver observations stand behind it), and each correction shows when it was last updated. No black box.
Who it's for#
TideTracker's beta is open to any diver in the Pacific Northwest. Whether you've been diving the Salish Sea for thirty years or just got certified last month, the planner gives you site-specific predictions to ground your day. If you already have opinions about slack timing at Deception Pass or the Tacoma Narrows, your reports feed the corrections everyone else sees — but you don't need that level of experience to use the app or to contribute. Newer divers can log dives and read the same briefings; experienced divers' observations carry extra weight against decades-old NOAA offsets, but they're one valuable input among many.
Join the beta#
The app is free during beta. Sign up with an email, verify, and you're in. Feedback goes straight to me — there's no support queue, no product team, just a solo developer who dives the same water you do.