Replacement Part List

Now for the real beauty of crossing nulls. Walk in a 5 foot circle around the

transmitter with the receiver rod held straight in front of you and notice that

you get a crossing null at two points of the circle, directly across from each

other and on a line that runs right through the center of the transmitter, parallel

with its long dimension.

What’s so special about this? Well, imagine that you can’t see the transmitter,

which is just like a real locating situation. In fact, have someone put the

transmitter under a box or newspaper and orient it in a way you can’t see.

Using the circle method, you can quickly determine which way the transmitter

is lying. And in a real pipe, almost always that means that the pipe lies along

that line, too. That can be very useful information when trying to locate in;

unknown lines, but it has even more usefulness for the next step in precision

locating

：

determining depth.