Offshore Supply Vessel — An Offshore Supply Vessel (OSV) — also called an offshore support vessel — is a ship designed to support offshore oil and gas operations. Typical roles include carrying cargo, fuel, water, and equipment to offshore platforms/rigs, and sometimes standby, anchor-handling, or crew-transfer support. Common related types include PSV (Platform Supply Vessel) and AHTS (Anchor Handling Tug Supply). OSV is a vessel type, not a training course name.