hello! all I have a customer that has a sewer line that I need to locate the line is fairly deep starts at 5' and due to the grade of the property it gets deeper! thats no big deal Ive located a line at about 12' deep with not much issue! but this job has a weird issue....there is a electrical vault about 12' away from the clean out that the camera is being fed down to locate further up the line. the sewer is cast iron and the electrical vault must be interfering with the camera transmitter head? does anybody have any advise on minimizing the interference or ways to help in locating in this situation. I've stuck the camera down a couple times and get real sketchy results! my equipment is a mini seesnake and a navitrak-1 I also have a line transmitter set-up 10 watt unit, but I under stand cast iron is a lousy transmitter and hard to trace, but it seems interference is not a problem though!??