The chart plotter for the modern mariner

Precise by design.
Calm by default.
Scroll to begin
Monaco · 43°44′N 007°26′E

Dawn over Port Hercule.

Every vessel on the anchorage, live. Sirena reads 20 nautical miles of coastline before you have finished your coffee.

47AIS targets
20 NMcoverage
LIVErefresh
Eagle eye → deck level

From the whole bay to your own bridge.

One gesture. The chart follows you down, all the way to a 150-metre yacht swinging at anchor off Monaco.

This is Sirena

Navigation that feels like the sea. Calm, deep, exact.

Layers · Sirena Chart

Our own chart. Nobody else's.

Sirena draws its own vector chart with buoys, lights and seamarks: crisp at every zoom, and stored on the phone. No signal? No difference.

Layers · Satellite

See your exact berth.

One tap flips the same chart to satellite imagery. Read the shallows by colour, pick your spot on the anchorage before you arrive.

Layers · Dark

Night watch, saved retinas.

A true dark chart for the 03:00 watch. Low glare on the bridge, instruments stay readable, your night vision stays intact.

Layers · AIS Traffic

Every ship around you. Live.

Colour-coded by class: cargo green, tankers red, passengers blue, sailing purple. Arrows show who is moving, dots who is moored. Tap for range and bearing.

Tools · Route

Plot a passage in seconds.

Drop waypoints, drag to refine. Distance, courses and ETA update as you draw. Monaco to Saint-Tropez before the espresso cools.

SOG
0.0kn
COG
---°T
HDG
205°T
43°43.71′N  007°26.25′E
◉ GPS ±3 m
Sirena Chart
SIRENA GLOBAL Motor yacht · 0.0 kn · anchored
43°43.71′N 007°26.25′E
54 NM · 4 h 30 m @ 12 kn
Sirena
Light
Dark
Satellite
AIS Traffic
AIS: 47 VESSELS
Track
Waypoints
Route
Signal
SOS
Layers
Locate
Fleet
Settings
+

Built by mariners.
For people who actually go to sea.

No feature bloat, no social feed, no dark patterns. A chart plotter that does the few things that matter at sea, impeccably.

🗺️

Offline everything

Charts, routes and tracks live on the phone. Mid-Atlantic or a Croatian cove, Sirena does not care about bars of signal.

📡

Live AIS traffic

Vessels around you with course and speed vectors, straight on the chart. Range and bearing one tap away.

🧭

Routes in seconds

Tap waypoints on the chart, get distance, courses and ETA instantly. Refine by dragging, like a pencil on paper but smarter.

Honest pricing

Premium app, transparent price, no bait-and-switch subscriptions. Founding members on the waitlist get the best terms we will ever offer.

First aboard, best berth.

Sirena Seafarer is in final App Review. Join the waitlist for launch day and founding-member pricing.

One email at launch. No spam, ever. Unsubscribe with one tap.