Small ships in the Strait of Hormuz are usually a mix of Iranian military fast boats, small service craft, coastal cargo vessels, tugs, and fishing boats. In tense periods, the fast boats get the most attention because they can be used to shadow, warn, inspect, or threaten larger ships moving through the waterway.
What people usually mean
When someone asks about the “small ships,” they often mean the many low- profile boats that appear on vessel trackers or are seen near tankers. Some are ordinary commercial or support vessels, but others belong to Iran’s Islamic Revolutionary Guard Corps and are part of a so-called “mosquito fleet” of small attack craft.
These boats are built for speed, swarming tactics, and close-range operations rather than for long patrols or open-sea travel. Reports describe them as hard to spot and useful in asymmetric naval tactics, which is one reason they attract so much concern in the Strait.
Why they matter
The Strait of Hormuz is one of the world’s most important shipping lanes, so even a small number of fast boats can have an outsized effect on traffic. Their presence can slow transits, raise insurance costs, and make commercial operators more cautious.
In recent reporting, analysts have linked these boats to harassment and seizure incidents, including operations near commercial vessels. That does not mean every small boat in the area is hostile; many are not.
Not all are military
A lot of the small craft in and around the strait are not part of any military force. Live vessel records show service boats, passenger craft, dhows, and small cargo vessels moving through the area alongside tankers and larger merchant ships.
So the short answer is: the small ships are often ordinary local traffic, but the ones people worry about most are Iran’s fast attack boats and related support craft.