Did someone realize a vessel running on turbogas systems?

I’m talking about the same system used for electric energy production from natural gas(hydrogen would be better..).

Surely.. ammonia is a viable hydrogen source…
Infact the process seems efficient
ammonia -> hydrogen -> turbogas global efficiency: around 60%…(energetically comparable to a diesel engine at an efficiency of 30%…).

If it doesn’t exist, what do you think about ?
Would it work well ?