the american practical navigator table 13 geographic range
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Feet
Meters
TABLE 13
Geographic Range
Height of eye of observer in feet and meters
7
10
13
680
Object Height
TABLE 13
Geographic Range
16
20
23
26
30
Object Height
33
36
2
3
4
5
6
7
8
9
10
11
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Feet
Object Height
Feet
Meters
Height of eye of observer in feet and meters
39
Meters
43
46
49
52
56
59
62
Object Height
66
69
12
13
14
15
16
17
18
19
20
21
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Feet
Meters
0
3
7
10
13
16
20
23
26
30
33
36
39
43
46
49
52
56
59
62
66
72
79
85
92
98
115
131
148
164
180
197
213
230
246
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
24
26
28
30
35
40
45
50
55
60
65
70
75
3.1
5.1
6.2
6.8
7.3
7.8
8.3
8.7
9.1
9.5
9.8
10.1
10.4
10.8
11.0
11.3
11.5
11.9
12.1
12.3
12.6
13.0
13.5
13.9
14.3
14.7
15.6
16.5
17.3
18.1
18.8
19.5
20.2
20.8
21.4
3.7
5.7
6.8
7.4
7.9
8.4
8.9
9.3
9.7
10.1
10.4
10.7
11.0
11.4
11.6
11.9
12.1
12.5
12.7
12.9
13.2
13.6
14.1
14.5
14.9
15.3
16.2
17.1
17.9
18.7
19.4
20.1
20.8
21.4
22.1
4.2
6.2
7.3
7.9
8.4
8.9
9.5
9.8
10.2
10.6
10.9
11.2
11.5
11.9
12.2
12.4
12.7
13.0
13.2
13.4
13.7
14.1
14.6
15.0
15.4
15.8
16.8
17.6
18.5
19.2
19.9
20.6
21.3
22.0
22.6
4.7
6.7
7.8
8.4
8.9
9.4
9.9
10.3
10.6
11.1
11.4
11.7
12.0
12.4
12.6
12.9
13.1
13.4
13.7
13.9
14.2
14.6
15.1
15.5
15.9
16.3
17.2
18.1
18.9
19.7
20.4
21.1
21.8
22.4
23.0
5.2
7.3
8.3
8.9
9.5
9.9
10.5
10.8
11.2
11.6
12.0
12.3
12.5
12.9
13.2
13.4
13.7
14.0
14.2
14.4
14.7
15.2
15.6
16.0
16.5
16.8
17.8
18.6
19.5
20.2
20.9
21.7
22.3
23.0
23.6
5.6
7.6
8.7
9.3
9.8
10.3
10.8
11.2
11.6
12.0
12.3
12.6
12.9
13.3
13.5
13.8
14.0
14.4
14.6
14.8
15.1
15.5
16.0
16.4
16.8
17.2
18.2
19.0
19.8
20.6
21.3
22.0
22.7
23.4
24.0
6.0
8.0
9.1
9.7
10.2
10.6
11.2
11.6
11.9
12.4
12.7
13.0
13.3
13.6
13.9
14.2
14.4
14.7
15.0
15.2
15.5
15.9
16.4
16.8
17.2
17.5
18.5
19.4
20.2
20.9
21.7
22.4
23.0
23.7
24.3
6.4
8.4
9.5
10.1
10.6
11.1
11.6
12.0
12.4
12.8
13.1
13.4
13.7
14.1
14.3
14.6
14.8
15.2
15.4
15.6
15.9
16.3
16.8
17.2
17.6
18.0
19.0
19.8
20.6
21.4
22.1
22.8
23.5
24.2
24.8
6.7
8.7
9.8
10.4
10.9
11.4
12.0
12.3
12.7
13.1
13.4
13.7
14.0
14.4
14.7
14.9
15.2
15.5
15.7
15.9
16.2
16.6
17.1
17.5
17.9
18.3
19.3
20.1
21.0
21.7
22.4
23.1
23.8
24.5
25.1
7.0
9.0
10.1
10.7
11.2
11.7
12.3
12.6
13.0
13.4
13.7
14.0
14.3
14.7
15.0
15.2
15.5
15.8
16.0
16.2
16.5
16.9
17.4
17.8
18.2
18.6
19.6
20.4
21.3
22.0
22.7
23.4
24.1
24.8
25.4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
24
26
28
30
35
40
45
50
55
60
65
70
75
0
3
7
10
13
16
20
23
26
30
33
36
39
43
46
49
52
56
59
62
66
72
79
85
92
98
115
131
148
164
180
197
213
230
246
0
3
7
10
13
16
20
23
26
30
33
36
39
43
46
49
52
56
59
62
66
72
79
85
92
98
115
131
148
164
180
197
213
230
246
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
24
26
28
30
35
40
45
50
55
60
65
70
75
7.3
9.3
10.4
11.0
11.5
12.0
12.5
12.9
13.3
13.7
14.0
14.3
14.6
15.0
15.2
15.5
15.7
16.1
16.3
16.5
16.8
17.2
17.7
18.1
18.5
18.9
19.9
20.7
21.5
22.3
23.0
23.7
24.4
25.1
25.7
7.7
9.7
10.8
11.4
11.9
12.4
12.9
13.3
13.6
14.1
14.4
14.7
15.0
15.3
15.6
15.9
16.1
16.4
16.7
16.9
17.2
17.6
18.1
18.5
18.9
19.3
20.2
21.1
21.9
22.7
23.4
24.1
24.7
25.4
26.0
7.9
10.0
11.0
11.6
12.2
12.6
13.2
13.5
13.9
14.3
14.7
15.0
15.2
15.6
15.9
16.1
16.4
16.7
16.9
17.1
17.4
17.9
18.3
18.7
19.2
19.5
20.5
21.3
22.2
22.9
23.6
24.4
25.0
25.7
26.3
8.2
10.2
11.3
11.9
12.4
12.9
13.4
13.8
14.2
14.6
14.9
15.2
15.5
15.9
16.1
16.4
16.6
16.9
17.2
17.4
17.7
18.1
18.6
19.0
19.4
19.8
20.7
21.6
22.4
23.2
23.9
24.6
25.3
25.9
26.5
8.4
10.5
11.5
12.1
12.7
13.1
13.7
14.0
14.4
14.8
15.2
15.5
15.7
16.1
16.4
16.6
16.9
17.2
17.4
17.6
17.9
18.4
18.8
19.2
19.7
20.0
21.0
21.8
22.7
23.4
24.1
24.9
25.5
26.2
26.8
8.8
10.8
11.9
12.5
13.0
13.4
14.0
14.4
14.7
15.2
15.5
15.8
16.1
16.4
16.7
16.9
17.2
17.5
17.7
18.0
18.3
18.7
19.2
19.5
20.0
20.3
21.3
22.1
23.0
23.7
24.5
25.2
25.8
26.5
27.1
9.0
11.0
12.1
12.7
13.2
13.7
14.2
14.6
15.0
15.4
15.7
16.0
16.3
16.7
16.9
17.2
17.4
17.7
18.0
18.2
18.5
18.9
19.4
19.8
20.2
20.6
21.5
22.4
23.2
24.0
24.7
25.4
26.1
26.7
27.3
9.2
11.2
12.3
12.9
13.4
13.9
14.4
14.8
15.2
15.6
15.9
16.2
16.5
16.9
17.1
17.4
17.6
18.0
18.2
18.4
18.7
19.1
19.6
20.0
20.4
20.8
21.8
22.6
23.4
24.2
24.9
25.6
26.3
27.0
27.6
9.5
11.5
12.6
13.2
13.7
14.2
14.7
15.1
15.5
15.9
16.2
16.5
16.8
17.2
17.4
17.7
17.9
18.3
18.5
18.7
19.0
19.4
19.9
20.3
20.7
21.1
22.1
22.9
23.7
24.5
25.2
25.9
26.6
27.2
27.9
9.7
11.7
12.8
13.4
13.9
14.4
15.0
15.3
15.7
16.1
16.4
16.7
17.0
17.4
17.7
17.9
18.2
18.5
18.7
18.9
19.2
19.6
20.1
20.5
20.9
21.3
22.3
23.1
24.0
24.7
25.4
26.1
26.8
27.5
28.1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
24
26
28
30
35
40
45
50
55
60
65
70
75
0
3
7
10
13
16
20
23
26
30
33
36
39
43
46
49
52
56
59
62
66
72
79
85
92
98
115
131
148
164
180
197
213
230
246
262
279
295
312
328
361
394
427
459
492
80
85
90
95
100
110
120
130
140
150
22.0
22.6
23.2
23.8
24.3
25.3
26.3
27.3
28.2
29.0
22.6
23.2
23.8
24.4
24.9
25.9
26.9
27.9
28.8
29.7
23.2
23.8
24.3
24.9
25.4
26.4
27.4
28.4
29.3
30.2
23.6
24.2
24.8
25.3
25.9
26.9
27.9
28.9
29.7
30.6
24.2
24.8
25.3
25.9
26.4
27.5
28.5
29.4
30.3
31.2
24.5
25.2
25.7
26.3
26.8
27.8
28.8
29.8
30.7
31.6
24.9
25.5
26.1
26.6
27.2
28.2
29.2
30.1
31.0
31.9
25.3
26.0
26.5
27.1
27.6
28.6
29.6
30.6
31.5
32.4
25.7
26.3
26.8
27.4
27.9
29.0
29.9
30.9
31.8
32.7
26.0
26.6
27.1
27.7
28.2
29.3
30.2
31.2
32.1
33.0
80
85
90
95
100
110
120
130
140
150
262
279
295
312
328
361
394
427
459
492
262
279
295
312
328
361
394
427
459
492
80
85
90
95
100
26.2
26.8
27.4
28.0
28.5
26.6
27.2
27.8
28.3
28.9
26.9
27.5
28.0
28.6
29.1
27.1
27.7
28.3
28.9
29.4
27.4
28.0
28.5
29.1
29.6
27.7
28.3
28.9
29.4
29.9
27.9
28.5
29.1
29.7
30.2
28.2
28.8
29.3
29.9
30.4
28.4
29.0
29.6
30.2
30.7
28.7
29.3
29.8
30.4
30.9
80
85
90
95
100
110
120
130
140
150
29.5
30.5
31.5
32.4
33.3
29.9
30.9
31.8
32.7
33.6
30.2
31.2
32.1
33.0
33.9
30.4
31.4
32.4
33.3
34.1
30.7
31.7
32.6
33.5
34.4
31.0
32.0
32.9
33.8
34.7
31.2
32.2
33.2
34.1
34.9
31.4
32.4
33.4
34.3
35.2
31.7
32.7
33.7
34.6
35.5
31.9
32.9
33.9
34.8
35.7
110
120
130
140
150
262
279
295
312
328
361
394
427
459
492
525
558
591
623
656
722
787
853
919
984
160
170
180
190
200
220
240
260
280
300
29.9
30.7
31.5
32.3
33.1
34.5
35.9
37.3
38.6
39.8
30.5
31.3
32.1
32.9
33.7
35.1
36.5
37.9
39.2
40.4
31.0
31.9
32.7
33.4
34.2
35.7
37.0
38.4
39.7
40.9
31.5
32.3
33.1
33.9
34.6
36.1
37.5
38.9
40.1
41.4
32.0
32.9
33.7
34.4
35.2
36.7
38.1
39.4
40.7
41.9
32.4
33.2
34.1
34.8
35.6
37.0
38.4
39.8
41.1
42.3
32.8
33.6
34.4
35.2
35.9
37.4
38.8
40.1
41.4
42.7
33.2
34.0
34.9
35.6
36.4
37.8
39.2
40.6
41.9
43.1
33.5
34.4
35.2
35.9
36.7
38.2
39.5
40.9
42.2
43.4
33.8
34.7
35.5
36.2
37.0
38.5
39.8
41.2
42.5
43.7
160
170
180
190
200
220
240
260
280
300
525
558
591
623
656
722
787
853
919
984
525
558
591
623
656
722
787
853
919
984
160
170
180
190
200
34.1
34.9
35.7
36.5
37.3
34.5
35.3
36.1
36.9
37.6
34.7
35.6
36.4
37.1
37.9
35.0
35.8
36.6
37.4
38.2
35.2
36.1
36.9
37.6
38.4
35.6
36.4
37.2
38.0
38.7
35.8
36.6
37.4
38.2
39.0
36.0
36.9
37.7
38.4
39.2
36.3
37.1
37.9
38.7
39.5
36.5
37.4
38.2
38.9
39.7
160
170
180
190
200
220
240
260
280
300
38.7
40.1
41.5
42.8
44.0
39.1
40.5
41.8
43.1
44.4
39.4
40.8
42.1
43.4
44.6
39.6
41.0
42.4
43.7
44.9
39.9
41.3
42.6
43.9
45.1
40.2
41.6
42.9
44.2
45.5
40.4
41.8
43.2
44.5
45.7
40.7
42.0
43.4
44.7
45.9
40.9
42.3
43.7
45.0
46.2
41.2
42.5
43.9
45.2
46.4
220
240
260
280
300
525
558
591
623
656
722
787
853
919
984
TABLE 13
Geographic Range
Object Height
Height of eye of observer in feet and meters
Feet
72
Meters
75
79
82
85
89
92
Object Height
95
98
115
22
23
24
25
26
27
28
29
30
35
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Miles
Feet
Meters
0
1
2
3
4
9.9
12.0
13.0
13.6
14.1
10.2
12.2
13.3
13.9
14.4
10.4
12.4
13.5
14.1
14.6
10.6
12.6
13.7
14.3
14.8
10.8
12.8
13.9
14.5
15.0
11.0
13.1
14.1
14.7
15.3
11.2
13.2
14.3
14.9
15.4
11.4
13.4
14.5
15.1
15.6
11.6
13.6
14.7
15.3
15.8
12.5
14.6
15.6
16.2
16.8
0
1
2
3
4
0
3
7
10
13
16
20
23
26
30
33
36
39
43
46
5
6
7
8
9
10
11
12
13
14
14.6
15.2
15.5
15.9
16.3
16.6
16.9
17.2
17.6
17.9
14.9
15.4
15.8
16.2
16.6
16.9
17.2
17.5
17.9
18.1
15.1
15.6
16.0
16.4
16.8
17.1
17.4
17.7
18.1
18.3
15.3
15.8
16.2
16.6
17.0
17.3
17.6
17.9
18.3
18.5
15.5
16.0
16.4
16.8
17.2
17.5
17.8
18.1
18.5
18.7
15.7
16.3
16.6
17.0
17.4
17.8
18.1
18.3
18.7
19.0
15.9
16.5
16.8
17.2
17.6
17.9
18.2
18.5
18.9
19.2
16.1
16.6
17.0
17.4
17.8
18.1
18.4
18.7
19.1
19.3
16.3
16.8
17.2
17.5
18.0
18.3
18.6
18.9
19.3
19.5
17.2
17.8
18.2
18.5
19.0
19.3
19.6
19.8
20.2
20.5
5
6
7
8
9
10
11
12
13
14
16
20
23
26
30
33
36
39
43
46
49
52
56
59
62
66
72
79
85
92
15
16
17
18
19
20
22
24
26
28
18.1
18.4
18.7
18.9
19.1
19.4
19.9
20.3
20.7
21.2
18.4
18.6
19.0
19.2
19.4
19.7
20.1
20.6
21.0
21.4
18.6
18.8
19.2
19.4
19.6
19.9
20.3
20.8
21.2
21.6
18.8
19.0
19.4
19.6
19.8
20.1
20.5
21.0
21.4
21.8
19.0
19.2
19.5
19.8
20.0
20.3
20.7
21.2
21.6
22.0
19.2
19.5
19.8
20.0
20.3
20.5
21.0
21.4
21.8
22.3
19.4
19.7
20.0
20.2
20.4
20.7
21.2
21.6
22.0
22.4
19.6
19.8
20.2
20.4
20.6
20.9
21.3
21.8
22.2
22.6
19.8
20.0
20.3
20.6
20.8
21.1
21.5
22.0
22.4
22.8
20.7
21.0
21.3
21.5
21.8
22.0
22.5
22.9
23.3
23.8
15
16
17
18
19
20
22
24
26
28
49
52
56
59
62
66
72
79
85
92
98
115
131
148
164
180
197
213
230
246
262
279
295
312
328
361
394
427
459
492
525
558
591
623
656
722
787
853
919
984
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
170
180
190
200
220
240
260
280
300
21.5
22.5
23.3
24.2
24.9
25.6
26.3
27.0
27.7
28.3
28.9
29.5
30.0
30.6
31.1
32.2
33.2
34.1
35.0
35.9
36.7
37.6
38.4
39.1
39.9
41.4
42.8
44.1
45.4
46.6
21.8
22.7
23.6
24.4
25.2
25.9
26.6
27.3
27.9
28.6
29.1
29.7
30.3
30.9
31.4
32.4
33.4
34.4
35.3
36.2
37.0
37.8
38.6
39.4
40.2
41.6
43.0
44.4
45.7
46.9
22.0
22.9
23.8
24.6
25.4
26.1
26.8
27.5
28.1
28.7
29.3
29.9
30.5
31.1
31.6
32.6
33.6
34.6
35.5
36.4
37.2
38.0
38.8
39.6
40.4
41.8
43.2
44.6
45.9
47.1
22.2
23.1
24.0
24.8
25.6
26.3
27.0
27.7
28.3
28.9
29.5
30.1
30.7
31.3
31.8
32.8
33.8
34.8
35.7
36.5
37.4
38.2
39.0
39.8
40.6
42.0
43.4
44.8
46.1
47.3
22.4
23.3
24.2
25.0
25.8
26.5
27.2
27.9
28.5
29.1
29.7
30.3
30.9
31.4
32.0
33.0
34.0
35.0
35.9
36.7
37.6
38.4
39.2
40.0
40.8
42.2
43.6
45.0
46.3
47.5
22.6
23.6
24.4
25.3
26.0
26.7
27.5
28.1
28.8
29.4
30.0
30.6
31.1
31.7
32.2
33.3
34.3
35.2
36.1
37.0
37.8
38.7
39.5
40.2
41.0
42.5
43.9
45.2
46.5
47.7
22.8
23.8
24.6
25.5
26.2
26.9
27.6
28.3
29.0
29.6
30.1
30.8
31.3
31.9
32.4
33.5
34.4
35.4
36.3
37.2
38.0
38.9
39.7
40.4
41.2
42.7
44.0
45.4
46.7
47.9
23.0
24.0
24.8
25.6
26.4
27.1
27.8
28.5
29.1
29.7
30.3
30.9
31.5
32.1
32.6
33.6
34.6
35.6
36.5
37.3
38.2
39.0
39.8
40.6
41.4
42.8
44.2
45.6
46.9
48.1
23.2
24.1
25.0
25.8
26.6
27.3
28.0
28.7
29.3
29.9
30.5
31.1
31.7
32.2
32.8
33.8
34.8
35.8
36.6
37.5
38.4
39.2
40.0
40.8
41.5
43.0
44.4
45.8
47.1
48.3
24.1
25.1
25.9
26.8
27.5
28.2
29.0
29.6
30.3
30.9
31.5
32.1
32.6
33.2
33.7
34.8
35.8
36.7
37.6
38.5
39.4
40.2
41.0
41.8
42.5
44.0
45.4
46.7
48.0
49.2
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
170
180
190
200
220
240
260
280
300
98
115
131
148
164
180
197
213
230
246
262
279
295
312
328
361
394
427
459
492
525
558
591
623
656
722
787
853
919
984
681
0
3
7
10
13
