The Irish state spent 20 years mapping its seabed.
Your phone just got the whole map.

INFOMAR — the national seabed survey by Geological Survey Ireland and the Marine Institute — has charted 700,000 km² of Irish waters over two decades. That's eight times the country's land area. Most boaters have never seen it. Maranox turns that survey into offline charts on your phone — depth, ground type, 608 shipwrecks, every pier and harbour — plus a full GPS plotter with tracks, routes, MOB and fishing marks.

Offline. On the phone you already own. Whether you're fishing, cruising, sailing, diving or paddling — if you float in Irish waters, you'll use this.

Who it's for

If you float in Irish waters, this is for you.

Global chart apps treat Ireland like a footnote. Maranox is built here, for here. Whatever takes you out on the water, you'll see it under you before it matters.

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Commercial fishermen

Sediment shows rock for pollock, clean sand for flatties. Find the right ground first time — stop losing gear.

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Weekend anglers

Stop burning petrol guessing where fish sit. Find the drop-offs, the rocky edges, the sand banks — in minutes.

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Cruising yachts

Know exactly how much water you have. Don't let a falling tide become a Coast Guard call or a hull repair bill.

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RIBs and day boats

MOB button, offline nav, route planner. The safety kit you can hand to your teenager when they take it out.

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Kayakers & SUP

Get home when the wind turns. GPS track back, hazard marks, MOB — no signal needed, ever.

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Divers & wreck hunters

608 Irish shipwrecks with GPS, seabed type around every wreck, depth contours for dive planning. See the wreck data ↓

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Sailing schools & charters

Turn any phone or tablet into a chart plotter. Teach on INFOMAR-grade data — without the €800 price tag of dedicated hardware.

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Coastal rowers

Currach, gig, or skiff — tracks, marks, and safety tools for clubs on every Irish coast.

INFOMAR Survey Data

See the seabed. Know what's under your hull.

INFOMAR is the most detailed seabed survey of Ireland ever made — twenty years of sonar data from the Geological Survey and Marine Institute. Depth. Ground type. Contour lines down to the metre. It's the best marine data available for these waters, and Maranox puts the whole thing in your pocket.

Coastal bathymetry with depth contours

See what's beneath you

Colour-coded depth and contour lines around the full Irish coast. The kind of detail a yacht skipper uses to avoid a bar and an angler uses to find a drop-off — same data, both jobs.

Sediment classification — mud, sand, gravel, rock

Know your ground

Not just how deep — what the bottom is made of. Mud, sand, gravel, rock, or mixed. Matters whether you're shooting gear, anchoring for the night, planning a dive, or picking a wreck.

Sediment and depth blended together

Depth and ground type together

Slide between sediment colours and depth contours. See where sand meets rock, where the ground drops off, where the good tows are. All in one view.

Satellite view with bathymetry overlay

Works offline at sea

Download the charts once on Wi-Fi. At sea, everything loads from your phone — no internet, no buffering, no signal needed. Mount a tablet in the wheelhouse and you've got a chart plotter.

Shipwrecks & Diving

608 wrecks. Every one on the map.

Geological Survey Ireland catalogued every known wreck in Irish waters. Maranox puts them all on the chart — with the seabed data a dive skipper actually needs to plan the dive.

608 Wrecks mapped
GPS Every position pinned
Offline Bundled in the app
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See the wreck on the seabed

Wreck position over INFOMAR bathymetry — see the depth, the contours around it, and the terrain the wreck sits on.

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Know your ground before you splash

Rock, sand, mud or mixed — the sediment layer shows what's around the wreck so you know what visibility and conditions to expect.

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Save your own dive sites

Drop marks on your favourite spots — reefs, walls, scenic dives, drift routes. Saved on your phone, always there.

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No signal? No problem.

All 608 wrecks are bundled in the app. Seabed charts download once. Works 50 miles offshore.

Tools

The rest of it

Marks, tracks, routes, safety.

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Marks & Waypoints

Long-press to drop a mark — dive sites, fishing spots, anchorages, hazards. Categorise and find them again.

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Track & Trip Log

Record your tracks and log catches. Species, weight, location. Browse by week.

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Route Planner

Tap A, tap B. Finds a route around land with distance.

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Man Overboard

Long-press MOB. Drops a GPS marker. Every second counts.

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Night Mode

Dark tiles for the wheelhouse at night. Saves your night vision.

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Satellite Basemap

Toggle satellite imagery of the land and coastline as a backdrop. Coast lines and harbours as they really look.

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Nautical Charts

OpenSeaMap buoys, lights, and marks overlaid on the map. The nav aids you expect on a proper chart.

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Tide & Wave Data

Live tide gauge readings and wave buoy data from the Marine Institute. Tap a station to see current conditions.

Signal to Shore · Maranox Beta

We're looking for early testers on Irish waters.

Maranox isn't in the app stores yet. Whatever boat you're on — trawler, cruiser, RIB, kayak — we want you using it on real trips and telling us what's broken before we open the doors.

Pick your platform below. Early testers keep lifetime access to everything we build.

Google Play · Internal Beta Open

Android

Sign up with the Gmail on your phone — install link lands in your inbox within 24 hours.

Apple TestFlight Coming soon

iPhone

TestFlight beta isn't open yet — we're finishing Apple review. Sign up on Android today, or check back here shortly for the iPhone invite.

Opening soon — no signup needed yet.

By signing up you agree to be contacted about Maranox beta testing. Your email is deleted once you're added as a tester or whenever you ask. See our privacy policy.