🛟 SIRENA
iPhone · In App Review

The open sea,
navigated from your iPhone.

Worldwide offline charts. Your position, course and speed at the helm. Live ship traffic, wind and sea, and an anchor watch that wakes you. No signal required.

We email you once, when Apple puts it on the App Store. Nothing else.
Bird's-eye view of Port Hercule, Monaco
Monaco · Port Hercule Dawn over the harbour.
Motor yacht Sirena at anchor off Monaco
Approach The yacht Sirena, swinging off the port.
On deck, Sirena Seafarer open on an iPhone showing GPS off Monaco
On deck Her position, live, in the water off Port Hercule.

Free for every sailor

🗺️ Charts that work with no signal

A worldwide nautical chart we render ourselves from OpenStreetMap data. Download your sea before you leave and it keeps drawing when the phone has no service at all.

📡 Live ship traffic

AIS vessels around you, coloured by type, with name, speed and heading. Free, not a paid add-on.

⚓ Anchor watch that wakes you

Set the swing circle and sleep. If the boat drags, the alarm sounds even with the phone locked and the ringer on silent.

🛥️ Your fleet on the chart

See the captains you sail with, wherever they are. Invite with a QR code, a link, or a phone number. Strangers only ever see an anonymous boat, and only if you choose to share.

🌬️ Wind and sea

Forecast arrows you can scrub forward hour by hour, plus gusts, temperature and wave height at any point you tap.

🧭 Routes, track and GPX

Drop waypoints, get distance, bearing and ETA at your real speed. Every voyage is logged and exports as a standard GPX file.

Sirena Premium

Everything above stays free. Premium adds charts, it does not take features away.

🛰️ Satellite chart

High-resolution imagery for reading an unfamiliar anchorage or a shallow entrance before you commit to it.

🚦 TSS charts

Traffic separation schemes: the shipping lanes and their separation zones, drawn on your chart.

🏁 Create race courses

Draw a start line, marks and a finish, then share it as a link. Anyone can join and sail your course for free.

$39.99 per year Family Sharing included: one subscription covers the whole crew.