High-Resolution Bathymetry

Navigate Volcanic Approaches and River Bar Crossings with Confidence

High-resolution bathymetric data transforms chart contour lines into intuitive 3D bottom representations, providing essential depth awareness when navigating into Atlantic island harbors, Iberian coastal ports, and the river bar entrances that guard access to major Portuguese ports. The graphic interpretation of contour data creates detailed bottom profiles invaluable for approach planning in waters where the seabed terrain is shaped by volcanic geology and Atlantic swell dynamics.

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 across this coverage area, where the Azores, Madeira, and Canary Islands rise from ocean depths exceeding 3,000 meters to above sea level within a few nautical miles, creating approach profiles where deep water transitions to harbor depth with almost no warning shelf, Portuguese river ports including Lisbon (Tagus), Porto (Douro), and Faro present bar crossings where depth, swell conditions, and tidal state must align for safe entry, and the continental shelf edge along the western Iberian coast generates steep depth gradients that affect wave behavior, current patterns, and vessel routing decisions within sight of shore.

Mariners approaching Horta in the Azores, entering Funchal harbor in Madeira, crossing the Lisbon bar into the Tagus estuary, or navigating the volcanic harbor approaches of Lanzarote and Tenerife benefit from bottom structure visualization that flat chart views cannot replicate. In open-ocean island approaches where the first indication of shallow water may be breaking swell on an unmarked reef, 3D depth awareness provides a margin of safety that traditional chart interpretation alone cannot match.

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 across the Atlantic islands and Iberian coast, where visual identification of harbor breakwaters, marina entrances, and anchorage positions against volcanic island terrain aids safe approach navigation. Mariners arriving at Azores harbors after multi-day ocean passages, identifying the correct approach to Canary Island marinas set into basalt cliffs, or distinguishing the entrance to Portuguese river ports from adjacent coastline, can correlate chart data with actual terrain appearance before committing to the final approach. After days of open-ocean passage, the ability to visually preview a landfall harbor before arrival restores situational awareness that extended offshore sailing naturally erodes.

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 is particularly valuable across the Atlantic island groups, where facility availability varies dramatically between main island commercial ports and secondary island harbors. Understanding which Azores islands offer full yacht service facilities, which Canary Island marinas provide customs clearance for transatlantic departures, and where fuel and provisioning are available along the Portuguese coast supports informed passage planning across a coverage area where the distance between full-service ports can span hundreds of nautical miles of open ocean.