TideHelm

A tide, current, solunar, marine-safety, fishing-log, route, anchor-scope, and coastal planning cockpit for captains, anglers, divers, and coastal photographers.

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What's new in 1.3

Tide Table (Almanac) NEW

A new tab shows every High and Low event for the next 7 days in a compact, scannable table: time, height in feet, and height relative to mean sea level. Filter to any single day or view all 7 at once. A share button generates a plain-text tide table you can paste into Messages, email, or a group chat — ideal for sharing the day's tides with a fishing or dive crew.

Slack Water Countdown NEW

The Today screen now shows a live countdown in the tidal events card — for example "2h 14m to slack water" — so you always know exactly how long until the window opens. When slack is under 30 minutes away, a "SOON" badge appears in the card.

Trip Leg Distances NEW

Every stop in the Trip Planner now shows the great-circle distance from the previous stop in nautical miles, with a Route Summary card displaying each leg and total trip distance. Uses coordinates already stored on each stop, so it works fully offline with no GPS required.

Why It Helps

TideHelm gives captains, anglers, kayakers, divers, and coastal photographers the tide timing, current direction, safety windows, and seamanship tools they need — all offline, all in one app.

Core Tools

Tide Table (Almanac) — 7-day numeric H/L table with share-as-text
Slack Water Countdown — live minutes-to-slack in the Today card
Trip Leg Distances — haversine nm per leg + total route distance
Seven-day tide chart with solunar overlay and sun/moon markers
Today view: next high, low, slack, sunrise, sunset, moon phase, solunar windows
24-hour current chart with flood/ebb vector arrows
Tidal Coefficient — 28-day spring/neap calendar (20–120 scale)
Rule of Twelfths — mid-tide height estimator
Anchor Scope Calculator — swing radius, chain angle, holding quality
Safety band: draft, air draft, bridge, bar safe-window planner
Multi-stop trip planner with slack-water departure windows
Wind-vs-tide chop alert with dual-arrow compass
Fishing log, solunar bite predictor, bait reference
Fuel range calculator with 1/3 reserve rule
Marine VHF channel and emergency procedures reference
NDBC buoy catalog, shellfish season calendar, sunset-shot planner

Fully Offline — No Account Required

TideHelm uses bundled harmonic data and astronomical calculations that run entirely on-device. There is no account, no network requirement, no ads, and no tracking. Thirty-one NOAA tide stations bundled from Eastport, ME to Friday Harbor, WA. All trip plans, fishing logs, and safety inputs are stored only on your device. The Tide Table can be shared as plain text — no cloud required.

App Interface

The screenshot below shows the current iPhone app interface.