# FastSeas: Weather Routing — Sailing Passage Planner

> Sailing Passage Planner (iPhone/iPad app by Extempo LLC.)

- Source: https://appshunter.io/ios/app/fastseas-weather-routing/id6811535054 (this page in markdown: same URL + `.md`)
- Developer: [Extempo LLC](https://appshunter.io/developer/6811535056)
- Category: Navigation, Weather
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 18 MB
- Languages: American English
- Released: 2026-10-03
- Data updated: 2026-10-08

## What is FastSeas?

FastSeas is a weather routing and passage planning tool built for sailors. Give it a start and finish point, and FastSeas calculates the fastest and most comfortable route using live NOAA GFS weather forecasts, real ocean surface current data, your vessel's actual sailing performance, and your own comfort criteria — not just a straight line on a chart.

WHAT FASTSEAS DOES

• Weather Routing — enter a departure point, destination, and time, and get back a real calculated route: distance, passage time, and a full track overlaid on an interactive weather map.

• Departure Planning — compare multiple candidate departure times side by side to find the best weather window for your passage.

• Vessel Performance — teach FastSeas your boat's real polar performance (create one from a few basic inputs, import an existing polar file, or hand-edit the numbers yourself) so every calculation reflects how your specific boat actually sails.

• Point Forecast — check detailed marine weather (wind, swell, pressure, cloud cover) at any point along your route or anywhere else on the chart.

• Route Export — export a calculated route as GPX, KML, or KMZ for your chartplotter or other navigation software, or as a plain CSV/printable table.

• Offline & Satellite Ready — FastSeas can also plan a route entirely by email, for sailors offshore with only a satellite communicator (Garmin inReach, Zoleo, and similar devices) and no regular internet connection.

GETTING STARTED

Sign in with a secure one-time email link — no password to remember or lose partway through a passage. An account is required to run routing calculations, and it keeps your vessel's performance and comfort settings between sessions.

A FastSeas account includes a free tier for exploring the app. A Premium subscription, managed through your FastSeas account online, removes the free tier's route-calculation limits.

FastSeas is a planning aid, not a substitute for official forecasts, charts, or seamanship — mariners remain solely responsible for their own navigation decisions.

## Is FastSeas safe?

Not enough ratings yet to assess FastSeas.

## Is FastSeas legit?

FastSeas: Weather Routing has limited verification signals. The AppsHunter Legitimacy Score for FastSeas is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-03

No release notes.

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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 2026-10-08.*