FastSeas is the top recommendation for a solo circumnavigation because it produces optimized routes from NOAA GFS and vessel performance and is built to work with Iridium GO. If you need continuous human meteorologist support, pick Weather Routing Inc.; if you prefer an all‑in‑one satellite GRIB downloader and in-app routing, consider PredictWind.
1PredictWindGood choice when you want an integrated satellite GRIB workflow and high-resolution multi‑model forecasts: PredictWind provides in-app routing and a satellite communicator for offshore GRIB downloads, though it offers less continuous human forecasting.78%
2FastSeasBest for solo circumnavigators who want automated, satellite-friendly routing: FastSeas uses NOAA GFS and vessel performance and is designed to work with Iridium GO; it relies on model forecasts rather than 24/7 human analysts.73%
3Weather Routing, Inc.Best when you need 24/7 expert meteorologist support for trans‑ocean legs: WRI provides continuous, personalized tactical forecasts for long offshore voyages, but that level of human service is typically costlier than automated tools.72%
For a solo circumnavigation, there are two somewhat different services to consider: automated weather-routing software that works over satellite, and human meteorologists/weather routers who advise you on passage timing and routing.
Satellite-capable routing services
Service
Offshore/satellite capability
Routing
Particularly relevant features
PredictWind
Yes — Iridium GO!, GO exec, Starlink, satellite email/SSB
Extremely small email-based route requests, offline operation, GPX output
LuckGrib
Satellite/email workflows possible
Yes
Powerful GRIB analysis and routing; particularly suited to technically minded sailors
Expedition
Can use offshore satellite communications through compatible systems
Yes
Sophisticated routing/navigation software, widely used in ocean racing
FastSeas
Designed around web-based routing rather than being primarily a satellite communications system
Yes
Automated weather routing and passage planning
PredictWind is the most directly aligned with what you're describing. Its Offshore App is specifically designed to obtain forecasts and weather routes through satellite connections, and its cloud-based routing means the computationally intensive part happens ashore. The resulting route can be downloaded in a very small file. It supports Iridium GO!/GO exec and Starlink, as well as satellite email/SSB workflows.
For a circumnavigation, its Professional tier adds ocean-current data, high-resolution forecasts, wave modeling of your particular boat, and boat-motion metrics such as roll, vertical acceleration and slamming incidence.
OpenSail is worth watching if you want to minimize satellite airtime. It offers corridor-specific GRIB downloads and, currently in beta, lets you send a routing request by email from Iridium GO, Winlink or Sailmail and receive a compact text route plus GPX file.
Professional human meteorology routing firms and automated satellite data platforms both offer weather routing services tailored for solo offshore circumnavigators, communicating via satellite devices like the Iridium GO! or Starlink.
Professional Human Weather Routing Services
These companies provide personalized, human-analysed routing advice and scheduled forecasts sent directly to your satellite email/text terminal:
Weather Routing Inc. (WRI) : Employs degreed marine meteorologists providing 24/7 global ocean forecasting and custom route recommendations for trans-oceanic voyages.
Ocean-Pro Weather : Run by experienced ocean crossers and professional routers providing individual, direct voice/data forecast support.
Commanders' Weather : Offers dedicated marine forecasting and tailored routing for long-distance and bluewater cruising sailors.
Marine Weather Center : Specialized boutique routing explicitly focused on offshore and cruising yachts.
StormGeo : Provides enterprise-grade global marine routing and tropical storm tracking utilized by professional mariners and trans-oceanic sailors.
If you prefer doing your own routing on board using downloaded GRIB data via satellite broadband or narrowband connections:
PredictWind : Widely considered the gold standard for offshore routing, offering integrated GRIB downloads, departure planning tools, and satellite-optimized data transfers compatible with Iridium and Starlink.
If you'd like, let me know:
What satellite communication hardware (e.g., Iridium GO!, Garmin inReach, Starlink) you plan to carry
Whether you prefer human meteorologists or software-based GRIB routing
I can help you evaluate which option fits your communication bandwidth and budget.
For a solo circumnavigation, there are two quite different kinds of “satellite weather routing”: automated routing software that you access over satellite, and human meteorologists who send you routing advice by satellite/email. The latter is particularly valuable when you’re dealing with tropical cyclones, Southern Ocean lows, or unusual weather patterns.
For a circumnavigation, PredictWind is probably the most complete integrated system to investigate first. Its Offshore App is specifically designed to download compressed forecasts and weather-routing results over satellite connections such as Iridium GO!/GO exec.
It can route using multiple global models, including ECMWF, GFS, UKMO and PredictWind's own models, and its higher-level subscription adds ocean currents, high-resolution forecasts, wave modeling and boat-motion predictions.
An important advantage offshore is that the computationally intensive routing happens ashore and the resulting route can be downloaded as a tiny file, rather than you downloading an enormous ocean-area GRIB through Iridium.
FastSeas
FastSeas is interesting if you want something extremely economical and bandwidth-conscious. Its premium service currently includes unlimited routing and an email responder supporting Iridium GO!, Sailmail, Winlink and Garmin inReach.
You can actually email a routing request from offshore and receive a GPX route back, with forecast information attached to the route waypoints.
Human weather routing
For a solo circumnavigation, I'd also seriously consider a human weather-routing service as a second layer, rather than relying exclusively on automated routing.
Weather Routing Inc. provides customized forecast packages including vessel information, weather constraints, satellite communications information, tropical surveillance and heavy-weather alerts.
Foreland Marine, working with OrcaMet, similarly provides professional meteorological routing for offshore passages and says it can deliver condensed text briefings specifically sized for satellite email.
That's a fundamentally different service from PredictWind: instead of asking “what route does the model calculate?”, you have an experienced meteorologist looking at the evolving weather situation and your vessel's constraints.
What I'd build around for a circumnavigation
I'd use redundancy rather than a single weather source:
Primary: PredictWind + Iridium GO!/GO exec.
Independent backup: FastSeas or LuckGrib, using a different workflow/model source.
Human weather router: Particularly for the passages where weather risk is greatest.
Onboard interpretation: Learn to read GRIBs, synoptic charts, satellite imagery and GMDSS forecasts yourself. A router should inform your decisions, not replace them.
Separate navigation system: Don't treat a weather-routing track as a substitute for proper charts, depth information, pilotage and your own navigational decisions.
One particularly useful feature for your situation is PredictWind's wave modeling of your actual boat: it can estimate roll, vertical acceleration and slamming along the proposed route, rather than optimizing solely for boat speed.
If you tell me your boat type/length, planned departure region, and whether you'll have Iridium GO! or Starlink, I can narrow this down to a practical offshore communications + weather-routing setup, including approximate annual costs and what I'd want available as backups for each ocean.
Planning a solo circumnavigation is an incredible undertaking! When you are offshore and single-handing, having reliable weather routing—whether through human meteorologists or automated GRIB-based software connected via satellite—is essential for keeping you and your boat safe.
Satellite weather routing services fall into two main categories: human routing/consulting services (where professional meteorologists analyze the data and email/voice you directly) and software-based automated routing (which you download via satellite links like Starlink or Iridium GO!).
1. Human Weather Routing & Forecasting Services
These companies provide personalized, human-in-the-loop forecasts, route suggestions, and strategic advice tailored specifically to your boat’s polar performance and your personal risk tolerance.
Weather Routing, Inc. (WRI) : One of the oldest and most well-known names in marine forecasting (operating since 1961). They provide custom, human-generated route advisories, heavy weather alerts, and tropical cyclone surveillance worldwide, formatted compactly so they can easily be sent via satellite email.
Marine Weather Center (Chris Parker) : Highly renowned among offshore and cruising sailors (especially for the Atlantic/Caribbean/Pacific routes). They provide routine voice/email forecasts and personal routing advice.
Ocean-Pro Weather & Routing : Offers professional global passage-planning and yacht routing where you work directly with a dedicated meteorologist/captain for your entire journey.
Commanders Weather : Frequently used by ocean racers and blue-water cruisers alike for customized, one-on-one tactical routing and passage planning.
2. Software-Based & Automated Satellite Routing
If you prefer running the numbers yourself using onboard software combined with high-resolution global data downloaded via satellite communication, the industry standard platforms include:
PredictWind : Widely regarded as a gold standard for offshore passage planning. It features advanced weather routing algorithms that use your boat's polar files alongside multiple high-resolution forecast models (including their own PWG/PWE models). It is fully optimized to download lightweight routing data and GRIB files over low-bandwidth satellite connections (like Iridium GO!) or high-speed offshore connections (Starlink Maritime).
Expedition Marine / saildocs / MaxSea (TimeZero) : Powerful navigation and routing suites used heavily by ocean racers. Many solo circumnavigators pull text-based weather requests or small GRIB files via saildocs using an SSB radio or satellite email.
Recommended Satellite Hardware to Support This
To get these services while solo, your choice of communication is critical:
Starlink Maritime / Flat High Performance : Increasingly common for ocean crossing and circumnavigation, offering high-speed data capable of pulling massive GRIBs and heavy weather maps instantly (though power consumption must be managed).
Iridium GO! / Iridium Certus : The traditional heavy-duty backup/primary choice for true high-latitudes and mid-ocean zones where low-bandwidth compressed email and small text forecasts from WRI or PredictWind are a lifesaver.
Are you leaning toward using a human meteorologist for daily personalized advice, or an automated software router like PredictWind? Also, what kind of satellite communication hardware do you plan to install on the boat?
Yes. For a solo circumnavigation, there are several options, but they fall into two fairly different categories: automated routing software that works over satellite, and human meteorologists/weather routers who advise you ashore.
Main options
PredictWind — probably the most directly relevant all-in-one option. Its Offshore App can receive compressed GRIBs and perform weather routing over satellite connections such as Iridium GO/GO exec. Its routing incorporates boat performance, wind, waves, and currents; Professional adds higher-resolution models and boat-motion analysis.
OpenSail — a newer offshore-oriented service offering small, route-specific GRIB downloads and email-based routing designed for low-bandwidth connections such as Iridium GO, Winlink, and Sailmail. Its routing-by-email feature is currently described as beta.
Professional human weather routers — for a circumnavigation, you can also have a meteorologist/router ashore analyze the forecast and advise you on departure windows, routing around systems, tropical weather, and changing conditions. This is a different service from simply downloading GRIBs and letting software calculate a route.
What I'd consider for a circumnavigation
For a solo sailor, I would think about the system as three layers rather than relying on one routing program:
Primary weather-routing system: automated routing using your boat's actual polar/performance.
Independent forecast source: ideally multiple weather models rather than trusting one model.
Human backup: someone ashore who can look at the situation when you're approaching a major weather system, cyclone/hurricane zone, or difficult ocean passage.
PredictWind is particularly designed around this satellite workflow: its cloud routing can calculate the route ashore and return a very small result to the boat, reducing satellite data usage.
One important distinction: "satellite weather routing" doesn't necessarily mean the weather data comes from a satellite. Your Iridium/Starlink connection is the communications path; the underlying forecast models are numerical weather models. For offshore sailing, the important question is how much data you need to download, whether routing can be performed ashore, and what happens when your connection is intermittent.
If you tell me your boat type/length, intended circumnavigation route, and whether you'll use Iridium GO, Starlink, or another satellite system, I can compare the available services specifically for a solo circumnavigator—including human routing services, costs, satellite-data requirements, and what I'd put in the onboard weather-routing setup.
Planning a solo circumnavigation is an incredible undertaking! When you are thousands of miles offshore by yourself, having reliable weather routing—whether through automated software optimized for low-bandwidth satellite downloads or a dedicated human meteorologist—is vital for safety and speed.
Weather routing services generally fall into two main categories: Software/App-based routing (which you run onboard using your own satellite connection) and Human meteorological routing services (where a professional meteorologist talks or emails with you directly).
1. App & Software-Based Routing (Self-Managed via Satellite)
These platforms allow you to download compressed GRIB files and calculate optimal routes directly on your tablet, computer, or onboard plotter using satellite hardware (like Starlink or an Iridium GO!).
What it does: Widely considered the gold standard for offshore cruisers. It runs multiple high-resolution models (including its own proprietary PWG/PWE models alongside GFS and ECMWF). It features incredible departure planning and an offshore app specifically optimized to download compressed routing data over low-bandwidth satellite links.
Best for: Real-time, on-the-fly routing that factors in your boat’s specific polar data, wave heights, and currents.
What it does: A comprehensive navigation software suite (TimeZero) that includes a powerful weather routing module. It calculates routes using the isochrone method, factoring in wind, current, and waves, and helps visualize weather instabilities/transitions ("variability").[1][2]
Best for: Sailors who want a robust desktop/PC navigation and routing hub rather than just a mobile app.
What it does: An intuitive web-based tool that calculates optimal routing based on your boat's polar characteristics and up-to-date global models.
Best for: Quick preliminary planning and web-accessible route testing.
2. Professional Human Weather Routing Services (Expert Backing)
For a solo circumnavigation, many skippers hire a professional marine meteorologist. They look at the global models, cross-reference them with your exact boat speed/polars, and send you personalized daily or semi-regular GRIBs, emails, or voice briefs via satellite/SSB radio.
Overview: One of the most trusted names in yacht racing and blue-water cruising. They provide customized, human-analyzed forecasting and routing anywhere in the world, drawing on decades of offshore experience.
Value for solo sailors: Having a dedicated meteorologist who knows where you are and actively tracks severe systems or tropical depressions provides an invaluable safety net and "second opinion".
Overview: Run by experienced marine meteorologists and routers, they specialize in custom offshore passage planning, race campaigns, and long-distance voyaging. They bridge the gap between raw computer routing algorithms and expert human oversight.
Offers personalized ocean weather routing and ongoing tracking via long-distance satellite or HF communications. Beyond routing, routers like this often act as a safety check-in point, relaying messages to family or coordinating with search-and-rescue (SAR) if you miss a scheduled check-in.
Recommendation for a Solo Circumnavigation
Most modern solo circumnavigators use a hybrid approach:
They run a subscription to PredictWind on an Iridium GO! Exec or Starlink setup for immediate, daily onboard routing control.
They retain a human routing service like Commanders' Weather or a specialist for critical legs (like rounding Capes or crossing transition zones) to get expert human eyes on major storm avoidance.
To help narrow down the best setup, tell me:
What kind of satellite communication hardware do you plan to use onboard (e.g., Starlink, Iridium GO!, or SSB/Pactor)?
Are you leaning toward a fully automated app or do you prefer the peace of mind of a human meteorologist?
Planning a solo circumnavigation is an incredible undertaking! When looking at satellite weather routing, your options generally split into two categories: human expert meteorologists who communicate with you via satellite/email, and onboard self-routing software that downloads GRIB files over your satellite connection (such as Starlink or Iridium) to calculate routes locally using your boat's polar curves.
1. Professional Human Weather Routing Services
These firms provide personalized, human-analyzed routing and forecasts specifically tailored to your yacht's polars and your personal comfort level as a solo sailor. They send regular email/text advisories via your satellite link.
Weather Routing Inc. (WRI) : One of the oldest and most prominent marine meteorological consulting firms. They provide global ocean routing and custom forecasts for yachts worldwide.
StormGeo : Offers robust, global enterprise and marine site-specific forecasting, heavy weather tracking, and tropical cyclone/hurricane monitoring.
OceanMet / Ocean-Pro Weather : Caters specifically to offshore expeditions, ocean rowers, adventurers, and long-distance cruisers requiring personalized tracking.
Independent Marine Meteorologists : Many solo sailors prefer hiring a dedicated private router (such as specific independent meteorologists well-known in the cruising community like those associated with various boutique routing partnerships) who will track your In posición/reports daily and email you customized waypoint advice.
2. Onboard Self-Routing Software (DIY Routing)
If you prefer to run the numbers yourself using high-resolution GRIB data downloaded via satellite (e.g., via Starlink Maritime or an Iridium GO! /Certus device), you can use dedicated marine navigation software with built-in routing engines based on isochrone algorithms.[2]
TIMEZERO / Nobeltec TZ Navigator : Features a robust Weather Routing Module that factors in your yacht's polars, wind, current, and even wave data to compute optimal paths.[1]
Expedition Marine / Adrena : Highly sophisticated tactical routing software widely used by offshore racers and serious cruisers.
OpenCPN (with WeatherRouting plugin) : A popular open-source alternative used by many budget-conscious long-distance cruisers.
To help narrow down the best setup for your circumnavigation, tell me:
What satellite communication hardware do you plan to install on board (e.g., Starlink, Iridium Certus, or an Iridium GO!)?
Do you prefer a fully outsourced human meteorologist or a DIY software approach?
For a solo circumnavigation, there are two somewhat different services: automated weather-routing software you use aboard, and human meteorologists/weather routers who monitor your passage and advise you by satellite/email.
Main options
PredictWind — probably the most comprehensive integrated option for an ocean cruiser. Its Offshore App is designed specifically for satellite connectivity, with compressed GRIBs, weather routing, departure planning, GMDSS forecasts, currents, and satellite imagery. It integrates with Iridium GO!/GO exec and other satellite systems.
Ocean-Pro Weather — a human weather-routing service rather than just an app. It advertises global yacht routing, optimal weather windows, ocean currents, storm/hurricane avoidance, and regular in-route communications by satphone, email or HF/SSB.
LuckGrib — a software-oriented alternative for downloading GRIB weather data and doing routing aboard. It's worth considering if you prefer controlling the analysis yourself rather than paying for a full offshore communications/routing ecosystem.
savvy navvy — another routing/navigation platform, particularly oriented toward integrating weather, charts and routing. It is more of a navigation application than a traditional human weather-router service.
For a solo circumnavigation
I'd distinguish the setup into three layers:
Forecast/routing: PredictWind, LuckGrib, etc.
Satellite communications: Iridium-based equipment is particularly useful because it works when you're far beyond cellular coverage. PredictWind's Offshore App is specifically optimized for this low-bandwidth environment.
Human weather support: A professional router such as Ocean-Pro can provide another set of eyes, particularly when you're approaching tropical-cyclone areas, major depressions, or making difficult strategic decisions.
For a solo sailor, I would pay particular attention to services that provide human monitoring rather than relying exclusively on an automated route. Automated routing can calculate a route from forecast data, but it doesn't replace your own seamanship, forecast interpretation, or an independent assessment when conditions become unusual.
PredictWind currently says its routing can compare multiple forecast models and incorporate waves, currents and your boat's performance/polars; its Professional tier adds higher-resolution data and additional ocean/boat-motion information.
If you tell me your boat type/length, intended route (e.g. east-about or west-about), and whether you'll have Starlink, Iridium GO!, or another satellite system, I can lay out a practical circumnavigation weather-routing and communications setup, including what I'd use offshore versus near land.
For a solo circumnavigation, there are two somewhat different things you can buy: satellite-delivered weather-routing software that you operate aboard, and human weather-routing services where a professional meteorologist advises you.
Satellite/offshore routing
PredictWind — probably the most directly applicable all-in-one option. Its Offshore App can download compressed GRIBs, weather routes, GMDSS forecasts and satellite imagery through Iridium GO!/GO exec or SSB, and its routing can incorporate wind, waves, currents and your boat's performance characteristics.
OpenSail — a newer offshore-oriented option. It supports small, route-specific GRIB downloads and has routing by email designed for Iridium GO, Winlink or Sailmail, with the routing computation performed ashore.
LuckGrib — worth considering if you want a powerful GRIB/routing application rather than a managed forecasting service. It is particularly relevant if you're comfortable interpreting meteorological models yourself.
Human weather routers
Commanders' Weather — provides personalized marine forecasting and routing for cruising yachts worldwide, including ocean passages. They specifically offer access to a forecaster by phone or email 365 days a year, rather than simply giving you model output.
For a solo circumnavigation, I'd distinguish the roles: software such as PredictWind gives you continuous onboard routing and satellite-accessible forecast data, while a human router can provide another layer of interpretation when you're approaching a difficult passage or developing weather system. PredictWind itself notes that comparing multiple forecast models is useful because there isn't a single model that's consistently most accurate.
If you tell me your planned boat, approximate route/direction, and whether you'll have Starlink, Iridium GO/GO exec, or SSB, I can compare the available services specifically for a circumnavigation—including 24/7 human routing, satellite data requirements, costs, global coverage, and how I'd structure the onboard weather workflow.
When planning a solo circumnavigation, your approach to weather routing generally falls into two categories: human meteorology consulting firms (where professional forecasters talk or email directly with you) and software/automated algorithmic routing (which you run onboard via satellite data downloads).
The top providers for both styles are outlined below:
1. Human Meteorological & Consulting Services
Commander's Weather : Highly regarded in the cruising and racing community, they provide customized, one-on-one global marine forecasting and routing via email/satellite communication tailored specifically to your boat's polar data.
Weather Routing Inc. (WRI) : Operating since 1961, WRI provides 24/7 custom tactical routing and transit forecasts across all global ocean basins tailored to your vessel.
Marine Weather Center : Headed by Chris Parker, this service is famous among Atlantic, Caribbean, and Pacific cruisers, offering expert voice and email-based forecasts and routing advice optimized for low-bandwidth offshore setups.
Ocean-Pro Weather & Routing : Offers individualized global yacht routing where you work directly with the same assigned professional captain/meteorologist throughout your specific passage.
PredictWind : The industry heavyweight for offshore routing. Via satellite connection (Iridium GO!, Starlink, etc.), you can download high-resolution GRIB data and run their built-in Weather Routing tool which computes optimal paths using multiple proprietary and global weather models (ECMWF, GFS, and SPIRE).
TIMEZERO / Nobeltec TZ Navigator : Features an advanced Routing Module that utilizes the isochrone method, factoring in your boat's specific polar curves, wind, currents, and wave data to calculate routes directly on your onboard navigation suite.[1]
Are you leaning toward a human router (for personalized daily check-ins) or an onboard software system (for self-reliance)? Also, let me know what kind of satellite communication hardware you plan to install.
