Offline nautical charts. Your GPS course, headings and depths. Route planning in seconds. No signal required, no subscription forced.
Vector nautical charts with depth contours, stored on your device. Zero bars, full picture.
Drop waypoints, get distance, bearing and ETA at your speed. Follow your track live.
Vessel traffic and weather unlock per passage. Pay for the trip, not another subscription.
Designed by people who stood real watches. The data you need at the helm, nothing in the way.
Sirena is built by a naval academy graduate with years in port operations, frustrated that real marine navigation still lives on €2,000 chartplotters while the best screen on the boat sits in your pocket.