# Quick Tide Sailing: Auto GRIB — Polar/routing/repeater/alarms

> Polar/routing/repeater/alarms (iPhone/iPad app by GanSoft SARL.)

- Source: https://appshunter.io/ios/app/quick-tide-sailing-auto-grib/id6787247113 (this page in markdown: same URL + `.md`)
- Developer: [GanSoft SARL](https://appshunter.io/developer/1895944235)
- Category: Navigation, Sports
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 31 MB
- Languages: American English, Croatian, Dutch, French (France), German (Germany), Greek, Italian, Norwegian Bokmål, European Portuguese, European Spanish
- Released: 2026-07-11
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/quick-tide-sailing-auto-grib/id6787247113/reviews.md

## What is Quick Tide Sailing?

Quick Tide Sailing plans and runs your passages, under sail or under power: routing, multi-model GRIB, current and tide, ORC polars, marine charts. Free to start.

THE ROUTING, AND WHY IT IS FASTER
Draw your route, pick a departure time, run the calculation. The isochrone algorithm looks for the fastest track from your polar, the wind, the swell, the current, the day/night cycle and your motoring rules, while clearing the coast.

The calculation advances by successive fronts, discarding the positions with no future. A classic router keeps, per sector, only the one furthest from the start. Upwind that criterion turns against you: the tack that gains towards the mark is not the one that goes furthest away — it gets discarded, and the route commits to a long losing board. Here each front keeps both, the most advanced and the closest to the finish.

Measured on Groix-Ouessant, same GRIB and same polar, 100 % sailing: 16 h 57 for 100 miles, against 20 h 40 for 152 miles on a well-established consumer router. Three hours forty less, 18 %. The gap comes from the algorithm, not from the engine.

AND FOR MOTORBOATS
Raise the "Motor below" setting above any speed under sail and enter your motoring speed: the routing becomes a power calculation, current, tide, swell and coastline included. Against a 5-knot tidal race, an 8-knot motor cruiser stakes its day on the time of passage.

THE CURRENT IS PART OF THE CALCULATION
Current is not a decorative overlay: it enters the routing. Useful wind is taken in the water frame, and speed over ground follows.
• From the Baltic to the Mediterranean, 412 current areas of at least 1 knot, surveyed over a full spring cycle
• Fine mesh where current makes the day: our own 100 m model on the English coast, Ifremer 250 m in Brittany and the Channel, BSH on the Elbe and the Belts, Copernicus Marine elsewhere
• Tide computed on board: heights, high and low waters, at any date, with no network
• Best departure time: a sweep compares the departures in your window and keeps the one that passes the races at the right moment

WEATHER AND MODELS
• ECMWF and GFS offshore, up to 10 and 16 days
• AROME 1.3 km and ARPEGE 0.1° (Meteo-France), ICON-EU 7 km and ICON-D2 2.2 km (DWD)
• The finest model for the area is offered; the GRIB follows the extent of your route

THE SOLENT, MODELLED FOR ITSELF
General-purpose current sources work on a 1.5 km grid — three cells across a channel three miles wide. We built our own: a hydrodynamic model of the Solent, the Isle of Wight, Hurst and the Needles on a 100 m mesh. Developed with AI assistance, from open data, checked against published tide gauge records. Harmonic tide: currents for any date, months ahead.

YOUR POLAR, MEASURED UNDER WAY
Start from the monohull and multihull library, from the ORC database — thousands of certified boats — or from your own CSV and .pol files.

Then build your own at sea. The capture workshop (experimental) fills an angle / wind-speed grid cell by cell as you sail: it waits for a settled regime, discards the minutes after a manoeuvre, flags doubtful cells. Interpolate the gaps, correct by hand, merge outings, export to .pol or .csv. That is your boat, not the sister-ship's.

The display then puts your speed against the target: 96 % upwind, you are still looking; 103 %, you are holding the right trim.

ON BOARD
• Instrument display (NMEA 0183, Signal K)
• Alarms: anchor drag, shallow water, strong wind, cross-track error, battery
• AIS, tracks, passage table, GPX export
• OpenStreetMap and OpenSeaMap charts: marks, soundings, seagrass
• Offline: cached charts, GRIB kept on board, tide computed without network
• Comparator: overlay several routings and replay them

GFS wind routing is free, without limit.
Auto-renewing subscription: it renews unless cancelled at least 24 hours before the end of the period, and can be managed in your App Store account settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly | $44.99 | per year |
| Monthly | $6.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $200.00 | one-time |



## Version history (last 5 releases)

### 1.2.27 — 2026-08-26

Layers: new "48 h" button. One tap updates every layer shown over the area you are looking at, two days ahead — and it tells you plainly what that area does not have.

The map no longer downloads anything on its own when you move it. Offshore, on a limited data plan or a slow link, you decide.

Settings: pick the app language by hand, without changing your phone's.

### 1.2.26 — 2026-08-25

Tide: the coefficient now appears at the top of the page, computed at Brest as in the almanacs — it holds for the whole coast.

Replay: the boat is finally visible over the animated current, and the clock grows while playing so you can see time moving.

Current: no more re-downloading on every map gesture, and "Offline" no longer appears when the link is merely slow. The app also tells you when a newer version is out.

### 1.2.23 — 2026-08-14

Currents: the fine field is back wherever it exists. The Gulf of Morbihan, Lorient roadstead and the Cornouaille rias were being served a 3.4 km field — a mesh at which an island-filled gulf doesn't exist, and where the current simply vanished. They now get 555 m. A current file could also be mistaken for a wind file at startup, opening the chart without a single barb.

Layers: animated view of wind and current — particles that follow the flow, so you read the streams and back-eddies rather than isolated arrows. A density slider per layer, and your choice of isobar spacing. The Layers button now blinks for as long as the current is loading.

### 1.2.21 — 2026-08-14

NMEA log (premium): record your instruments' raw stream on board at the touch of a button, and replay it once ashore. A log from OpenCPN or Signal K reads just as well: yesterday's sail becomes a polar, without going back out. A file with no timestamps is refused rather than processed — a wrong polar looks right.

Routing: "Compute from my position" starts where you are, not from the plotted start point. And when no wind model answers, the chart says so instead of leaving you waiting.

Display: the battery panel (voltage, charge, runtime, wear) and the polar target had stayed in French across all ten languages. Fixed — as have iOS's permission prompts, which spoke French to everyone before the app had even opened.

### 1.2.20 — 2026-08-11

Display: wind and speed no longer jump about. In a seaway the wind gauge could swing nearly twenty knots in three seconds — reading 10, then 30, then 15 in a single glance. Values are now smoothed over three seconds: enough to be readable, little enough that you still feel a header at once. Depth is not smoothed — a shallow-water alarm must never arrive late.

Gateways: units that prefix their sentences (Yacht Devices, Digital Yacht, any Signal K server relaying NMEA 0183) were not merely misread — they were ignored outright, without a single message. Fixed: your gauges now fill in.

Currents: when the area is too large the chart asks you to zoom in, instead of leaving you waiting for a server refusal.

Polar: adjustable damping makes recording possible in a seaway, where the masthead swings about in the swell. Cells you never sailed stay empty instead of being invented — your routing will no longer plan an upwind leg the boat cannot hold. And a reference polar, from the builder or a sister-ship, no longer overrides your own measurements: it only fills what you have yet to sail.

'Refine my polar' is at last reachable from the polars screen.

## More apps by GanSoft SARL

- [Modalissimo Ear Training](https://appshunter.io/ios/app/modalissimo-ear-training/id6766067876)
- [Rando/VTT Météo - Carte IGN](https://appshunter.io/ios/app/randovtt-meteo-carte-ign/id6797539167)

All apps by GanSoft SARL: https://appshunter.io/developer/1895944235

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*