Using the following information, what should the observer send to the FDC as their deviation refinement for a registration? OT Factor of 2; Spottings of +7R, +15R, -5L, and +3R.

To determine the correct deviation refinement for a registration in this scenario, calculations involving the observed spot values and the OT Factor need to be considered.

The OT Factor of 2 means you will multiply the observed deviations by 2 to refine your adjustments. The observer has provided four spot values: +7R, +15R, -5L, and +3R. First, we analyze these spottings.

1. Calculating the total deviation:

• For Right deviations: +7R + +15R + +3R = +25R

• For Left deviations: -5L = -5

2. Net deviation:

• Net deviation = Total right - Total left = +25 - 5 = +20R.

3. Applying the OT Factor:

• Since the OT Factor is 2, we must halve the net deviation to compute the final adjustment before sending it to the Fire Direction Center (FDC).

• Therefore, +20R becomes 20R divided by 2, which gives us +10R.

4. Final Direction:

• Since the deviation is positive and indicates right, the observer should send a refinement of "Right