About
SailDocs is a pioneering email-driven data service designed specifically for offshore sailors who rely on satellite connections such as Iridium, Sailmail, and Winlink. Since 1995, it has delivered millions of weather forecasts and documents worldwide by allowing users to request data entirely via email — no web browser or high-speed internet required. At its core, SailDocs delivers custom GRIB-1 weather forecast files from multiple global and regional models. The free tier includes NOAA's GFS global model, while additional models such as ECMWF, ICON, HRRR, NAVGEM, COAMPS, RTOFS ocean currents, and WW3 wave details are also available. Users define a geographic bounding box, grid resolution, forecast time steps, and desired weather parameters in a simple email syntax. Beyond GRIB data, SailDocs can fetch and convert web pages to plain text, retrieve text-based weather bulletins (NWS forecasts, tropical updates, offshore reports), and serve documents from a curated sailing and weather reference library — all formatted to minimize satellite data costs. Scheduled delivery is another key feature: sailors can subscribe to automated weather updates at defined intervals and durations, ensuring they receive daily forecasts during long passages without manual requests. The service is operated by Sirius Cybernetics LLC and was created by Jim Corenman, co-founder of Sailmail, making it a trusted cornerstone of the offshore sailing community.
Key Features
- Custom GRIB Weather File Requests: Request tailored GRIB-1 weather forecasts from models including GFS, ECMWF, ICON, HRRR, and COAMPS by specifying a geographic area, grid resolution, forecast hours, and weather parameters via a simple email command.
- Web Page & Document Retrieval: Fetch any web page or document and receive it converted to plain text, making it readable over low-bandwidth satellite email connections without a browser.
- Scheduled Automated Deliveries: Subscribe to recurring weather forecast or bulletin deliveries at set times and intervals, ensuring automatic daily updates during offshore passages without sending repeated manual requests.
- Multiple Weather Model Support: Access a range of global and regional weather models including RTOFS ocean currents and WW3 wave models, in addition to the free NOAA GFS baseline model.
- Bandwidth-Optimized File Sizes: All delivered files are compressed and formatted to minimize data transfer costs on expensive satellite connections such as Iridium and Winlink.
Use Cases
- An offshore sailor on a Pacific crossing uses SailDocs to receive daily GFS GRIB weather files via Iridium satellite email to plan routing around developing storms.
- A cruising sailor without internet access retrieves NWS tropical weather bulletins and offshore reports as plain-text emails to stay informed about hurricane activity.
- A delivery crew sets up a 14-day scheduled subscription for twice-daily wind and wave forecasts before departing on a long bluewater passage.
- A sailor uses SailDocs to convert marine weather websites to plain text and receive them via Winlink when anchored in a remote location with no cell service.
- A race navigator compares multiple weather models (GFS, ICON, WW3) by requesting GRIB files from each to optimize sail trim and routing decisions during an offshore regatta.
Pros
- Works on Ultra-Low Bandwidth Connections: Designed specifically for satellite email services like Iridium and Sailmail, making it uniquely suited for offshore use where standard internet access is unavailable or prohibitively expensive.
- Free NOAA GFS Model Included: The core NOAA GFS global weather model is available at no cost, giving sailors access to essential forecast data without any subscription fee.
- Proven & Long-Running Service: Operating since 1995 with millions of deliveries, SailDocs has a strong track record of reliability trusted by the global offshore sailing community.
- No Special Software Required: Any email client capable of sending and receiving messages can be used to request data, requiring zero additional apps or hardware.
Cons
- Email-Only Interface: All interactions are conducted through email commands, which requires users to learn a specific request syntax and is less intuitive than a graphical interface.
- Advanced Models May Require Payment: Premium weather models such as ECMWF are not included in the free tier, potentially requiring additional subscriptions or fees for full access.
- Niche Use Case: The service is purpose-built for offshore sailors on satellite connections; users with standard broadband access would be better served by conventional weather apps or websites.
Frequently Asked Questions
How do I request a weather forecast from SailDocs?
Send an email to [email protected] with a formatted request in the subject or body, specifying the model, geographic bounding box, grid resolution, forecast time steps, and weather parameters (e.g., WIND, WAVES). SailDocs will reply with the GRIB file.
Is SailDocs free to use?
The NOAA GFS global weather model is available for free. Some additional weather models (such as ECMWF) and features may require payment or a Sailmail/Winlink membership.
Can I receive automated daily weather updates during a passage?
Yes. You can set up a scheduled subscription by including timing parameters (e.g., time=06:00 days=14) in your request, and SailDocs will automatically send updates at those intervals for the specified duration.
What satellite email services work with SailDocs?
SailDocs is compatible with any email-capable satellite service, including Iridium, Sailmail, and Winlink, and is specifically optimized to minimize data usage on these connections.
Can SailDocs retrieve web pages for me at sea?
Yes. Send an email with the target URL in the body and SailDocs will fetch the page, convert it to plain text, and email it back to you — no browser needed.
