LakeMap – Swiss Lake Charts

LakeMap is the offline chart plotter for Swiss lakes: 22 surveyed lakes with official bathymetry (swisstopo swissBATHY3D) ship inside the app — depth contours, depth shading, seamarks and marinas all work with no connection at all.

THE DIFFERENCE: DEPTHS FROM THE LIVE LAKE LEVEL Ordinary charts show depths against a fixed datum. LakeMap computes with the current water level (Swiss federal gauges, FOEN): the depth you see is today's depth — at low autumn levels just as after snowmelt.

PREDICTIVE SHALLOW-WATER ALERTS The app projects your course 60 seconds ahead and warns in four tiers before the bottom comes up, with distinct alert tones. Unsurveyed water is treated as a hazard: zones without depth data render violet and raise their own alert tier instead of falsely looking safe.

CHART & NAVIGATION • Depth contours and bands from swisstopo swissBATHY3D • Seamarks and buoys, harbours and marinas (OpenStreetMap) • Own position with smoothed course and speed (COG/SOG) • Depth readout under your boat • Automatic lake detection

WEATHER & STORM WARNINGS Hourly wind and gust forecast per lake (MeteoSwiss ICON models), cached offline with visible age. Cues at the official Swiss storm-warning thresholds (strong wind from 25 kn, storm from 33 kn) plus official warnings for your lake.

THE LAKES Lake Zurich, Lake Constance, Lake Lucerne, Lake Thun, Lake Brienz, Lake Biel, Lake Neuchâtel, Lake Murten, Lake Geneva, Walensee, Lake Zug, Lago Maggiore, Hallwilersee, Ägerisee, Baldeggersee, Sempachersee, Sarnersee, Lac de Joux, Silsersee, Silvaplanersee, Lungernsee, Rotsee.

IMPORTANT LakeMap is not an official navigational aid. Official charts and the shore storm-warning lights remain authoritative. Data: © swisstopo, FOEN, MeteoSwiss/Open-Meteo, OpenStreetMap.