High-Resolution Bathymetry

Navigate Strait Channels and Shallow Approaches with Confidence

High-resolution bathymetric data transforms chart contour lines into intuitive 3D bottom representations, providing essential depth awareness when navigating into Scandinavian ports, archipelago anchorages, and the depth-restricted strait passages that connect the North Sea to the Baltic. The graphic interpretation of contour data creates detailed bottom profiles invaluable for approach planning and transit routing in waters where the seabed terrain directly dictates which channels are available to deep-draft vessels.

The BathyVision feature displays bottom topography in color and contour line overlays, allowing mariners to dynamically adjust the visualization to suit their navigation needs. This capability is particularly critical in the Skagerrak and Kattegat, where the Kattegat’s average depth of approximately 23 meters creates draft restrictions that affect routing decisions for commercial vessels throughout the strait system, the Norwegian Trench running through the Skagerrak drops to over 700 meters, creating extreme depth gradients between the deep central channel and the shallow coastal margins, and the Swedish west coast archipelago presents rock-bound channels where precise depth awareness prevents grounding on unmarked granite shoals.

Mariners transiting the Oresund approaches, entering the Gothenburg fairway through the outer archipelago, or navigating the shallow Danish coastal passages toward the Limfjord, benefit from bottom structure visualization that flat chart views cannot replicate. For commercial vessels managing under-keel clearance through the strait system, BathyVision provides the kind of continuous depth context that supports safe speed and routing decisions in restricted waters.

Satellite Photo Overlay

See the Real Landscape Behind the Chart

TZ Maps fuses satellite photography with raster and vector chart data, presenting only the visual information essential for safe navigation. Standard-resolution satellite images are included in every TZ Maps data pack, with high-definition options available for selected areas.

This overlay capability proves especially valuable in the Skagerrak and Kattegat, where visual identification of harbor breakwaters, marina entrances, and anchorage positions against the low-lying Danish coastline and the rocky Swedish archipelago aids safe approach navigation. Mariners arriving at unfamiliar harbors along the Swedish west coast, distinguishing the correct channel entrance through the Gothenburg archipelago, or identifying the approach to Danish harbors from offshore, can correlate chart data with actual terrain appearance before committing to the final approach. In the complex island landscape of the Bohuslan coast, where dozens of narrow passages wind between granite islands, satellite overlay provides the visual confirmation that helps mariners match chart symbols to real-world features.

Detailed Land Information

Understand the Coastline and Nearby Infrastructure

Beyond waterway navigation data, TZ Maps integrates detailed land information that enhances understanding of coastlines and nearby infrastructure. Road networks, settlement locations, and coastal facility positions are rendered alongside maritime chart data.

This integrated land detail supports voyage planning across the Skagerrak and Kattegat, where mariners transit between three countries with distinct port facilities, fuel availability, customs requirements, and marine service infrastructure. Understanding which harbors offer fuel bunkers, which have customs clearance for non-Schengen arrivals, and which provide haul-out or repair facilities is essential when planning passages through a region where port options are numerous but unevenly equipped.