If you’re still on the cruise and want to try and make use of this device I can think of two options. This is really just an assisted listening device anyone could use w/o any hearing aids necessary. It will just amplify whatever sounds it picks up, which presumably your hearing aids may be doing already equally.
1- if your hearing loss is minimal, just use this device in your ears directly w/o aids and turn volume all the way up.
2 - Switch aids to t-coil and put the earbuds directly on/near your hearing aid (not in your ears). You may have to position it oddly to get best sound pickup. It might not be most ideal but in most cases it will pick up some level of sounds which may or may not help.