Macoui

Macoui, Marine weather & offline routing

Macoui is a marine weather and isochrone routing application designed by a sailor, for real-world use at sea.

Built for offshore sailing, long-distance cruising, and low-connectivity environments, Macoui focuses on clarity, simplicity, and true offline operation.

Clear and practical marine weather
- Fast and readable marine weather visualization
- Simple map-based interface inspired by proven navigation tools
- Side-by-side use of multiple weather models to support decision-making

Available weather models:
- ECMWF
- GFS 0.25°
- GFS 0.50°
- ICON
- ICON EU
- COPERNICUS CURRENT
- AROME
- ARPEGE
- GFS WAVES

Isochrone routing for offshore sailing
- Weather-based route calculation
- Designed for ocean passages and long crossings
- Routing as a decision-support tool, not an automated pilot

The navigator remains in control at all times.

True offline mode
- Download GRIB files in advance
- Full functionality without internet access
- Reliable use offshore and in remote areas

Local cache management ensures continued operation even when connectivity is lost.

Multiplatform and onboard-friendly
- Works on phones, tablets, and computers
- Optimized interface for onboard use

Macoui is currently in beta:
- Some features are still evolving
- Occasional bugs may occur
- User feedback is essential to improve the application

Project philosophy
- Free to use
- Offline-first
- No cloud dependency
- Designed with safety, redundancy, and simplicity in mind

Macoui does not aim to replace existing navigation tools, but to offer a modern, lightweight, and accessible alternative for marine weather analysis and routing.

Tutorials and documentation:
https://macoui.app