Tsunamis are only an issue close to shore. In the ocean it's barely a mild wave.
In a boat going further out is the safest thing you can do if there's a tsunami warning.
Depends on how the tsunami was created. By earthquake or by land slide. For example, the following tsunami no boat is safe.
https://en.wikipedia.org/wiki/Cumbre_Vieja_tsunami_hazard
Safer than going inland..?
Depends on how the tsunami was created. By earthquake or by land slide. For example, the following tsunami no boat is safe.
https://en.wikipedia.org/wiki/Cumbre_Vieja_tsunami_hazard