The history and methods of dip-shooting are outlined and the degree of accuracy obtainable by the method is investigated. Plotting of the misclosures on 151 dip-shooting traverses in the Gulf Coast to yield a frequency curve shows a probable error of about 87 feet, in traverses averaging 27,500 feet in length. This error is apparently independent of the length of the traverse, and within the range of spreads commonly used, that is, from 1,400 to 2,400 feet, independent of the spacing of the dip determinations. The smoothness of the frequency curve is broken by an excessive number of misclosures greater than 250 feet. These may be due to unusual structural conditions on the traverses concerned, such as terracing between dip points or faulting, or to gross personal errors. he principal common errors appear to lie in the drafting of the profiles, the determination of the time step-out, and the weathering correction. These errors on individual dips may considerably exceed the probable error, but on traverses of average length will tend to compensate one another. Other sources of error are discussed, but are believed to be of minor importance.