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The Marine Sextant, Continued
Reading Positive
An example of what the scales would look like if you had a positive
Index Error
index error is shown in figure 8-17. Notice that the index mark is to the
left of the 0 on the arc scale and that the 0 on the vernier scale is above
the 0 on the micrometer drum, indicating a positive error. The
micrometer and vernier scale lineup directly at the 0.4' line on the
vernier scale, indicating an index error of +0.4'. This would be
subtracted from any angles taken with this sextant to obtain an accurate
angle.
Figure 8-17. Positive index error.
8-31
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