Maranox: Irish Seabed Charts

Maranox shows you what is under your hull. It brings INFOMAR — the Irish state's seabed survey — to the phone you already carry.

Built for recreational boats on Irish waters: sea anglers, divers, cruising yachts, RIBs, kayakers and sailing schools. Start with the complete streamed seabed-depth map and useful local tools without creating an account.

Included chart and boat tools
• Complete streamed INFOMAR bathymetry — seabed depth and contour lines around the Irish coast.
• Lighthouses, RNLI lifeboat stations, the twelve-mile limit, and OpenSeaMap buoys and marks.
• Save fishing marks and waypoints — long-press to drop a spot, anchorage, dive site or hazard, then name and categorise it.
• Record GPS tracks and review your trips by week.
• Plan a route — set waypoints and see straight-line distance, bearing and ETA.
• Man Overboard — long-press to mark your current position to assist your own search (not a distress beacon).
• Keep a local fishing logbook and trip history on this device.
• Night mode with dark charts to protect night vision.

Maranox Pro
Upgrade inside the app for combined Depth + Sediment, shipwrecks, satellite imagery, live tide gauges and wave-buoy data, downloadable offline chart packs, cloud backup and cross-device sync, and advanced EMODnet fishing and traffic layers. Available plans and any eligible introductory offer are shown with localised store terms before purchase.

Your local data
Marks, tracks and logbook records work on this device without an account. Removing the app can erase local-only data. Maranox Pro cloud backup and sync help protect and use supported records across signed-in devices.

Not for navigation
Maranox is a planning and situational-awareness tool. It is not a certified navigation system and must not be used as your primary means of navigation. Always carry paper charts, a VHF radio and proper safety equipment.

Who built it
Maranox is made by two Irish boaters who wanted the charts they use on the water to match the survey data the state already paid for. It uses public INFOMAR data under a Creative Commons Attribution 4.0 licence (Geological Survey Ireland and Marine Institute), with attribution shown in the app.

Feedback
Tap Send Feedback in the app and it reaches us directly. Bugs, ideas and harbour requests are all welcome at contact@maranox.ie