Hello Carmine, Martin is correct, you should consult with a knowledgeable Peplink supplier or a local Peplink partner. The performance issues he mentions can be severe in a vessel.
Depending on the Peplink model selected, the requirements for the current modems available can be separate for Asia / Pacific than Europe / Americas usage. Also Peplink is going through a generation change of their model line at this time. Some models will allow modem module upgrades without changing the expensive router platforms. I would not select a HD4 at this time for a worldwide vessel, the modems can not be upgraded. I would consider a HD4 MBX, HD2 MBX or BPL-SDX and plan on upgrading the cellular modules. But note that I have not yet seen the specifications on the next generation Cat 18 modules for how they will work in Hong Kong and Asia.