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Lookout Marine

A fast, native chartplotter for Mac, iPad, iPhone, Android and Linux. It draws official ENC charts with the IHO portrayal rules, straight to the GPU with Metal or Vulkan, and holds 60 fps.

Not for navigation

This is a prototype. It is not pixel-perfect and it makes no claim of ECDIS conformance.

macOS · iPadOS · iOSLinux
Annapolis Harbor on iPad, day schemeAnnapolis Harbor on Linux, day scheme
SwiftUIGTK4

These pages​

  • Architecture — the shared Zig core, the C ABI, the GPU backends, and how each native shell connects to them.
  • The Linux host (GTK4) — the GTK4 shell in detail. It shows how the host composites the chart to make the chrome float above it. It also describes the two designs that failed.
  • Screenshot protocol — the chart, the camera, and the window size that each host must use. You can then compare the hosts frame by frame.

macos/README.md and android/README.md in the repository describe the Apple host and the Android host. The chart engine has its own documentation at tile57.

To learn why the project has this structure — one core and several native shells written by AI — refer to the README.