Coverage — Helm Nautical

See what we've surveyed

6,169 Canadian lakes with real, government-surveyed depth data — every contour shown as surveyed, with its age. Enter your email and we'll send a code.

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Modern — surveyed 1990 or later

Historic — older survey, still real soundings

Sparse — points only; shoals between them are not shown

Dashed — open water covered in grid squares, not a lake boundary

Shaded areas have surveyed depth data — tap one for its details, and zoom in to see the survey itself. Depth is shown exactly as surveyed, including its age. Nothing here is modelled or estimated. Not for navigation — carry official charts.

See what we've surveyed

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