NavList:

Lu Abel wrote:

>One thing I find more than a bit annoying about US charts is that while
>all coastal and larger-area charts have edge-scales for lat and long in
>degrees and minutes, many harbor charts use degrees, minutes, and
>seconds.  Since my GPS wants data entered in a consistent format (which
>I have set to degrees and minutes), when I encounter such a harbor
>chart, I have to convert seconds to decimal fractions of a minute.
>
>Out from my nav table comes this old slide rule!  Put the "1" over the
>"6" (preferably on the A/B scales rather than the C/D scales) and I've
>got a very effective seconds to fractional minutes converter!
>
> 
>
I had to do a very large number of these conversions on U.S. Light List
coordinates a couple years ago. I made up the table shown below and
taped it to the side of my computer screen for reference. Eventually, I
discovered I'd memorized most of it, and could fill in the blanks in my
head.

Carl Herzog
Providence, RI

Sec   Dec
1    0.02
2    0.03
3    0.05
4    0.07
5    0.08
6    0.10
7    0.12
8    0.13
9    0.15
10    0.17
11    0.18
12    0.20
13    0.22
14    0.23
15    0.25
16    0.27
17    0.28
18    0.30
19    0.32
20    0.33
21    0.35
22    0.37
23    0.38
24    0.40
25    0.42
26    0.43
27    0.45
28    0.47
29    0.48
30    0.50
31    0.52
32    0.53
33    0.55
34    0.57
35    0.58
36    0.60
37    0.62
38    0.63
39    0.65
40    0.67
41    0.68
42    0.70
43    0.72
44    0.73
45    0.75
46    0.77
47    0.78
48    0.80
49    0.82
50    0.83
51    0.85
52    0.87
53    0.88
54    0.90
55    0.92
56    0.93
57    0.95
58    0.97
59    0.98
60    1.00




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