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On a typical boundary survey the instrument is sighted on a point from which angles will be measured, the backsight, and the next survey point where the instrument will be set up to continue the survey around the property, the foresight.
Intermediate foresights, often "called sideshots," are points to which measurements are made other than the foresight or backsight.
For example, a survey instrument is set up over a point. The horizontal angle on the instrument is set on 0 while sighting on a backsight point that may be a couple hundred feet away. A measurement will be taken to the foresight point which may also be a couple hundred feet away.
There may be a survey marker near the point where the instrument is set up to which a measurement needs to be made. This measurement is called an intermediate foresight or a sideshot.
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