... + 4) x 90? Where n = number of traverse stations. Hence sum = (2 x 4 + 4) x 90? = 1080? An error of 30Vn seconds is generally acceptable in surveying for construction/engineering works. If there is a bigger error then the measurements should be taken again. 30Vn = 30V4 = 60" Therefore our acceptable error = 60" Our error is 11" Correction into traversed survey = 11"/ 4 = 2.75" Therefore 2.75" needs to be deducted from our survey to allow for the error during the survey. Because we need to avoid decimal of seconds, what is preferable is that I minus 3" from the three bigger external angle readings and the minus 2" from the lowest external angle reading. This will result in a total of 11" correction to the traverse survey and lead to the correct sum angle of 1080? 00' 00". STATION MEAN ANGLE DEDUCTION CORRRECT EXTERNAL ANGLE Station A 300? 35' 00" 3" 300? 34' 57" Station B 241? 27' ...

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