The OTT had a slow top speed and often had a bad habit of sinking. It performed more reliably as an aquatic surface repulsorcraft. Two versions of the craft existed, one armed and one unarmed. The armed version was described as a battleship.
The OTT was used to deliver battle droids for assaults against the cities of Spinnaker and Theed. Possibly a modified MTT, the OTT was also used at the Battle of Naboo to invade the underwater Gungan cities.