Adds definitions to the definitions section of the Tsunami Warning and Education Act to define 'Indian Tribe', 'Native Hawaiian organization' (including Department of Hawaiian Home Lands and Office of Hawaiian Affairs), and 'Tribal organization' by reference to other statutes.

Adds a new purpose requiring that data and metadata be managed, archived, and made fully available for operations, research, education, and mitigation activities, and makes other conforming edits to the stated purposes of the Act.

Substantive amendments to the tsunami forecasting and warning program provisions: adds new detection sources (e.g., global navigation satellite system network, tidal and water level gauges, buoys), requires support for seismic stations and GNSS data streams, establishes cooperative efforts with the USGS (including incorporating tsunami notifications into the USGS Earthquake Early Warning System), requires Tsunami Warning Coordinators at centers, mandates fail-safe capabilities and specified drills, expands outreach and mapping responsibilities, and adds reporting and standardization requirements for centers.

Amends the national tsunami hazard mitigation program to expand inclusion of Indian Tribes, Tribal organizations, and Native Hawaiian organizations throughout program text, add coastal digital elevation models, probabilistic tsunami hazard analysis maps, evaluations of sediment transport and debris impacts on critical infrastructure, development and repository maintenance of inundation/evacuation maps, standardized evacuation mapping guidelines, and inclusion of tsunami source parameters.

Modifies the tsunami research program to expand eligible participants (including Tribal organizations and Native Hawaiian organizations and Tribal Colleges or Universities), broaden research scope to include seismic and non-seismic tsunamis and social and behavioral science research including data collection, require development of a data portal and decision support tools, and add a research and development plan to be produced within 12 months and updated at least every 36 months.

Amends provisions related to the global tsunami warning and mitigation network (section 807), including insertion at subsection (d) (text insertion point shown) and related conforming edits to reflect program changes and coordination.

Amends the Tsunami Science and Technology Advisory Panel provision (section 808/3206a(b)(1)) by inserting additional text at the specified point, and updates reporting and consultation requirements elsewhere related to the Panel's functions.

Amends 33 U.S.C. 3208 to expand the list of entities to coordinate with (adding Indian Tribes, Tribal organizations, and Native Hawaiian organizations), make minor punctuation changes in paragraphs (2) and (3), and add two new outreach activities at the end addressing work with tsunami‑prone rural communities and education about the TsunamiReady program.