If you live near the ocean or travel near the sea regularly, tsunamis are a very real threat that can strike at any time. Fortunately, you can keep an eye on them with a tsunami tracking app or other tools on your PC, smartphone or tablet.

This completely free app for the United States has so many features that it’s hard to pick a favorite. It’s ridiculously easy to customize; you can select alerts from basic coastal and shoreline flood alerts to high-surge warnings to tsunami advisories, warnings, and alerts (along with countless other disaster types).

Additionally, the homepage of this app is cleverly designed so that you can check alerts, find disaster preparedness information, and find disaster or evacuation resources all in one place.

To facilitate communication after a tsunami or other natural disaster, the app even lets you share real-time notifications with loved ones via text, email, and social media.