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HOW to Reduce a Sunline Using Pub 229, Continued
OPNAV 3130/30
ACTION
Completed Strip
Pub 229 Naut Alm
Form
Dec Inc /d
Dec Inc = True Dec min. only / d = d from
17.6 / +38.1
Pub 229 entered with whole degrees of
LHA, Dec, and Lat. (See fig. 9-10.)
Tens / DSD
Enter from the Pub 229 interpolation tables
+ 8.8
located on the inside of the front and back
cover. (See fig. 9-11.)
Units / DSD corr
Same as above.
+ 2.4
Total Corr
Total of tens and units.
+ 11.2
Hc (Tab)
Enter from Pub 229.
26°
07.5'
Hc (Comp)
Apply Total Corr to Hc (Tab).
26°
18.7'
Ho
Drop Ho down from the top of the form.
25° 53.3’
a
Subtract the higher value of either
A 25.4
Hc(Comp) or Ho from the other. In this
case, Ho is subtracted from Hc(Comp).
Z
Zn
The A means away. We will fully explain
Towards and Away when we plot the LOP.
Enter from Pub 229. Apply the rules for 2
just as with our azimuth problem.
LHA is greater than 180 so Zn = Z.
105.8
105.8
We have now completed the sight reduction solution for a sunline. The goal
was to obtain an LOP. Where is the LOP you ask? Everything we need is
right here. We will use the Zn (true bearing), a (intercept), and assumed
position to plot our LOP. Let’s move on to that task right now.
9-26
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