Abstract: A marine pipeline surveying apparatus useful for locating buried pipelines includes a barge having a work deck with a dolly mounted on the work deck for movement on the deck upon a provided track. A slot in the barge can be provided so that workers can move completely around the dolly. The dolly provides a gimbal type articulating support for supporting a hollow casing during operation. The gimbal support allows the articulating movement to compensate wave action on the barge so that the wave action is not transmitted to the casing. During operation a magnetometer placed in the casing bore can be used to "roughly" position the barge and casing above the pipeline to be located. Then the barge can be anchored in position over the pipeline as dictated by the magnetometer "rough" positioning. The magnetometer is then removed from the casing bore and the casing provides a guide for a probe rod such as a jet probe which is placed within the casing.