QGIS

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QGIS is a free geoinformation system for viewing, editing and collecting spatial data.
Actuel version is QGIS 3.34.3 (01-2024).

OpenSeaMap as basemap

OpenSeaMap consists of OSM, Seamarks and the coordinate grid.

For each create an entry in "Browser - XYZ Tiles" (rightclick "New connection...")

OSM: https://a.tile.openstreetmap.org/{z}/{x}/{y}.png

Seamark: https://t1.openseamap.org/seamark/{z}/{x}/{y}.png