**How To Calculate the Location of a LightHouse ...**
**Updated: 2 days ago ...**
**Geographic Range of a light ...Created by ... Ocean Navigator ... June 3 ... 2020 ... Lighthouse visibility is available ... On Charts ... Both Paper and Digital ... and ... Is Stated in Terms of ... Nominal Range ... This is the rating of the power of the light and describes the distance at which the light will be seen in standard ... Clear ... Conditions ... But ... There are Factors That May Change That ... The most obvious factor is ... Worsening Visibility ... As Precipitation ... Haze or Fog Thickens ... This is the Distance at Which a light Will Visibly Diminish ... A table for determining the distance that a light with a certain nominal range can be seen is printed at the beginning ****of the ... ****Light List**** ... This is an Annual Publication From the U.S. Coast Guard that is Compiled for ... Each Coast Guard District ... The toughest part about using this graph is that the ... The Visibility Must Be Known ... This May Prove Challenging At Times ... The Result You Obtain From the Graph is Called the light’s ... Uminimous range ... the distance at which it can be seen in prevailing visibility conditions ... When it Comes to lighthouses ... the easiest factor to quantify is the ... Problem of the Curvature of the Earth’s Surface ... Depending on your height of eye Above the Sea Surface ... It is Only Possible to See Another Object From a Certain Distance No Matter How Bright it's light ... There is a simple formula for calculating this ... Distance ... in Miles = is ... 17 Times the Square Root of Your Height of Eye ... in Feet ... With a height of eye of ... 9 feet Above the water ... a Voyager can see the Horizon at ... 117 times the square root of 9: 1.17 X 3 = 3.5 miles ... This may not seem very far when compared to ... A lightHouse with a Nominal Range of 18 miles ... However ... The Height of the light Above Sea level is Also a Factor ... In The Visibility Calculation ... This Height is listed on The Chart Next to the ... light... As well ... So ... The Geographic Range ... The Range at Which the light is Visible Before the Horizon Gets in the Way ... of The light ... must also be determined using the same formula ... In the Case of a light 61 Feet Above Sea level ... see the Chart Excerpt of Watch Hill Light Below ... the geographic range equals 1.17 times the square root of 61 .1.17 X 7.81 = 9.13 miles ...To Determine the Range at Which the light is Visible to us Given our Height of Eye ... we add the geographic range of the light to the distance from our height of eye to the horizon ... In our Case ... We Said We Had a Height of Eye of 9 Feet ... which gave us a distance to the visible horizon ... of 3.5 Miles ... We add that to the geographic range of the light ... 3.5 + 7.81 ... and ... We Get ... 11.31 Miles ... This is less Than the Nominal Range of 15 Miles for the Watch Hill Light ... so we should see the light at ... Approximately 11.31 Miles ... By ... Ocean Navigator ... ****PREVIOUS Post Propulsion Spirit 1.0 Plus 3HP Electric Outboard 1s Now Available in the U.S .****... ****NEXT Online 1s ... Virtual Installer Trainings ... July 14-16**** ...**

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