Real-time water level overlay

Marine charts show depths against a fixed reference. This overlay shows how today's water level compares to the long-term seasonal normal at each station — so you know when chart depths can be trusted, and when they can't.

Station

Saimaa, Lauritsala

Saimaa

Other stations

Saimaa

Keitele

Kallavesi

Pielinen

Päijänne

Decision-support data, not a chart correction

The official nautical chart remains the authoritative reference. This overlay surfaces real-time hydrological data alongside the chart so the operator can make informed decisions. The boater retains full responsibility for navigation.

Sources

Water level — SYKE Hydrologiarajapinta

Nautical charts — Traficom open data

Reference period: 2015–2026 · ~4158 obs/station