48.1? 48.12? 48.123? 48.1234?
How many digits of precision do we need for RVing?
1 degree of latitude (and 1 degree of longitude at the equator) equals 60 nautical miles. A nautical mile is 6,076.11549... (it goes on and on!) feet in length. Close enough to 1.15 statute miles, which makes 1 degree equal to 69 statute miles.
(nautical miles are interesting: 1 minute = 1 nautical mile, so the world is 60*360 nautical miles North South, and around the equator or 21600.
| decimals | degrees | miles-statute | feet | inches |
|---|---|---|---|---|
| 0 | 1 | 69 | 364320 | 4371840 |
| 1 | 0.1 | 6.9 | 36432 | 437184 |
| 2 | 0.01 | 0.69 | 3643.2 | 43718.4 |
| 3 | 0.001 | 0.069 | 364.32 | 4371.84 |
| 4 | 0.0001 | 0.0069 | 36.432 | 437.184 |
| 5 | 0.00001 | 0.00069 | 3.6432 | 43.7184 |
| 6 | 0.000001 | 0.000069 | 0.36432 | 4.37184 |
The difference between 48.898748 and 48.898749 is 4.4 inches.
Four digits, or around 36 feet, is really about all you need for normal navigation with your RV.
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