Table 13: Geographic range of light
| Height of light: | ||
| Height of eye: | ||
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|
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| H | = | height of light above sea level (feet) | |
| h | = | height of eye above sea level (feet) | |
| D | = | distance to horizon (nm) |
| Height of light: | ||
| Height of eye: | ||
|
|
||
| H | = | height of light above sea level (feet) | |
| h | = | height of eye above sea level (feet) | |
| D | = | distance to horizon (nm) |