| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Ship | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Boat | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Cargo vessel | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Harbor and coastal craft | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Passenger vessel | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Surface craft, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Sailboat, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Ferry, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Ocean freighter, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Powered watercraft, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Surfboard, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Canoe, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Raft, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Hovercraft, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Fishing boat, device | Is a | True | Watercraft, device | Inferred relationship | Existential restriction modifier |  | 
| Victim of watercraft accident | Causative agent | True | Watercraft, device | Inferred relationship | Existential restriction modifier | 1 | 
| Driver in watercraft accident | Causative agent | True | Watercraft, device | Inferred relationship | Existential restriction modifier | 2 | 
| Water-skier in watercraft accident | Causative agent | True | Watercraft, device | Inferred relationship | Existential restriction modifier | 2 | 
| Bystander in watercraft accident | Causative agent | True | Watercraft, device | Inferred relationship | Existential restriction modifier | 2 | 
| Passenger in watercraft accident | Causative agent | True | Watercraft, device | Inferred relationship | Existential restriction modifier | 2 |