The US Survey Foot might seem like an unassuming unit, but it’s steeped in the very history of American land measurement. Unlike the International Foot, which is precisely defined as 0.3048 meters, the US Survey Foot is ever-so-slightly longer at approximately 0.3048006 meters. This minuscule difference stems from surveying practices established in the early 19th century and has historically been used for mapping and property delineation across the United States. Integral to the country’s westward expansion, the US Survey Foot played a pivotal role in the division and sale of public lands—underscoring its foundational impact on both real estate and infrastructure.
Despite its historical significance, the US Survey Foot was officially deprecated at the end of 2022, as the US moves towards a unified use of the International Foot for federal geodetic surveys. This transition simplifies engineering and scientific calculations, streamlining US standards with global practices. The legacy of the US Survey Foot, however, serves as a fascinating footnote in the story of American land development, marking an era when precise measurements charted the course of a growing nation.
The nautical mile, a critical unit used in maritime and air navigation, is distinct from the standard mile in its basis on the Earth’s geometry. Defined as exactly 1,852 meters, it represents one minute of latitude. This unit’s origin is deeply linked to the elliptical shape of our planet, making it remarkably convenient for charting a course along the Earth’s curved surface. Interestingly, its historical adoption can be traced back to the early 20th century, when international standardization made it the universal measure for maritime and aviation purposes.
This unit is associated with speed measurements at sea and in the air, such as knots. A knot, which equals one nautical mile per hour, emphasizes the unit’s prevalence in global navigation. Understanding the nautical mile’s unique correlation with Earth’s circumference and its importance in navigation can deepen one’s appreciation of geographic exploration and cartography.
| US Survey Feet | Nautical Miles |
|---|---|
0
ft-us
|
0
nMi
|
1
ft-us
|
0.000164579
nMi
|
2
ft-us
|
0.000329158
nMi
|
3
ft-us
|
0.000493737
nMi
|
4
ft-us
|
0.000658316
nMi
|
5
ft-us
|
0.000822895
nMi
|
6
ft-us
|
0.000987474
nMi
|
7
ft-us
|
0.00115205
nMi
|
8
ft-us
|
0.00131663
nMi
|
9
ft-us
|
0.00148121
nMi
|
10
ft-us
|
0.00164579
nMi
|
11
ft-us
|
0.00181037
nMi
|
12
ft-us
|
0.00197495
nMi
|
13
ft-us
|
0.00213953
nMi
|
14
ft-us
|
0.00230411
nMi
|
15
ft-us
|
0.00246869
nMi
|
16
ft-us
|
0.00263326
nMi
|
17
ft-us
|
0.00279784
nMi
|
18
ft-us
|
0.00296242
nMi
|
19
ft-us
|
0.003127
nMi
|
20
ft-us
|
0.00329158
nMi
|
21
ft-us
|
0.00345616
nMi
|
22
ft-us
|
0.00362074
nMi
|
23
ft-us
|
0.00378532
nMi
|
24
ft-us
|
0.0039499
nMi
|
25
ft-us
|
0.00411448
nMi
|
26
ft-us
|
0.00427906
nMi
|
27
ft-us
|
0.00444363
nMi
|
28
ft-us
|
0.00460821
nMi
|
29
ft-us
|
0.00477279
nMi
|
30
ft-us
|
0.00493737
nMi
|
31
ft-us
|
0.00510195
nMi
|
32
ft-us
|
0.00526653
nMi
|
33
ft-us
|
0.00543111
nMi
|
34
ft-us
|
0.00559569
nMi
|
35
ft-us
|
0.00576027
nMi
|
36
ft-us
|
0.00592485
nMi
|
37
ft-us
|
0.00608942
nMi
|
38
ft-us
|
0.006254
nMi
|
39
ft-us
|
0.00641858
nMi
|
40
ft-us
|
0.00658316
nMi
|
41
ft-us
|
0.00674774
nMi
|
42
ft-us
|
0.00691232
nMi
|
43
ft-us
|
0.0070769
nMi
|
44
ft-us
|
0.00724148
nMi
|
45
ft-us
|
0.00740606
nMi
|
46
ft-us
|
0.00757064
nMi
|
47
ft-us
|
0.00773521
nMi
|
48
ft-us
|
0.00789979
nMi
|
49
ft-us
|
0.00806437
nMi
|
50
ft-us
|
0.00822895
nMi
|
51
ft-us
|
0.00839353
nMi
|
52
ft-us
|
0.00855811
nMi
|
53
ft-us
|
0.00872269
nMi
|
54
ft-us
|
0.00888727
nMi
|
55
ft-us
|
0.00905185
nMi
|
56
ft-us
|
0.00921643
nMi
|
57
ft-us
|
0.00938101
nMi
|
58
ft-us
|
0.00954558
nMi
|
59
ft-us
|
0.00971016
nMi
|
60
ft-us
|
0.00987474
nMi
|
61
ft-us
|
0.0100393
nMi
|
62
ft-us
|
0.0102039
nMi
|
63
ft-us
|
0.0103685
nMi
|
64
ft-us
|
0.0105331
nMi
|
65
ft-us
|
0.0106976
nMi
|
66
ft-us
|
0.0108622
nMi
|
67
ft-us
|
0.0110268
nMi
|
68
ft-us
|
0.0111914
nMi
|
69
ft-us
|
0.011356
nMi
|
70
ft-us
|
0.0115205
nMi
|
71
ft-us
|
0.0116851
nMi
|
72
ft-us
|
0.0118497
nMi
|
73
ft-us
|
0.0120143
nMi
|
74
ft-us
|
0.0121788
nMi
|
75
ft-us
|
0.0123434
nMi
|
76
ft-us
|
0.012508
nMi
|
77
ft-us
|
0.0126726
nMi
|
78
ft-us
|
0.0128372
nMi
|
79
ft-us
|
0.0130017
nMi
|
80
ft-us
|
0.0131663
nMi
|
81
ft-us
|
0.0133309
nMi
|
82
ft-us
|
0.0134955
nMi
|
83
ft-us
|
0.0136601
nMi
|
84
ft-us
|
0.0138246
nMi
|
85
ft-us
|
0.0139892
nMi
|
86
ft-us
|
0.0141538
nMi
|
87
ft-us
|
0.0143184
nMi
|
88
ft-us
|
0.014483
nMi
|
89
ft-us
|
0.0146475
nMi
|
90
ft-us
|
0.0148121
nMi
|
91
ft-us
|
0.0149767
nMi
|
92
ft-us
|
0.0151413
nMi
|
93
ft-us
|
0.0153059
nMi
|
94
ft-us
|
0.0154704
nMi
|
95
ft-us
|
0.015635
nMi
|
96
ft-us
|
0.0157996
nMi
|
97
ft-us
|
0.0159642
nMi
|
98
ft-us
|
0.0161287
nMi
|
99
ft-us
|
0.0162933
nMi
|
100
ft-us
|
0.0164579
nMi
|
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