A seabed object detection system can include a source array and a data processing system. The source array can include a first source and a second source. The data processing system can include one or more processors. The data processing system can determine a first position of the first source and can identify a first firing time of the second source. The data processing system can initiate a first source shot of the first source at the first position and the second source at the first firing time. The data processing system can determine a target position and estimated position for the first source. The data processing system can determine a second position of the first source based on a difference between the target position and the estimated position. The data processing system can initiate a second source shot of the first source at the second position.