If the observer's OT Factor is 2 with spotting's of +7R, +15R, -5L, and +3R, what deviation refinement should be sent to the FDC?

To arrive at the correct deviation refinement, you start by calculating the average adjustment based on the spotting values provided. The observer's OT Factor of 2 indicates that the impact deviations need to be multiplied by this factor when reporting.

First, you analyze the spot values:

• +7R (Right)

• +15R (Right)

• -5L (Left)

• +3R (Right)

Convert all adjustments into a single aggregate measure:

1. Add the right spots: +7 + 15 + 3 = +25R

2. Account for the left spot: -5L, which can be expressed as +5R for our calculations.

Now, convert them to one side (Right):

• Total = +25 + 5 = +30 (to the right)

Next, divide this total deviation by the number of spotting values, which is four:

Total deviation = +30 / 4 = +7.5R

Since the OT Factor is 2, this average deviation needs to be doubled:

Average deviation = +7.5R * 2 = +15R

To refine the deviation for the FDC, we express this adjustment. The refinement based on the average impacts pushes the final adjustment left