Navigation - Geographic Range

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Capt. Dave Medeiros explains how to calculate Geographic Range, which is how far from an object you can be and still see it.
Looking to become a licensed mariner or continue your professional maritime training? Obtain your training and certification with Northeast Maritime Institute. We offer on-site and online training for US and International seafarers. Visit www.northeastmaritime.com for more information.
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Navigation Plotting is an essential skill for working in the maritime industry. This video is an introduction to some of those concepts. If you've spent lots of time on the water, but have not pursued a professional license, you should consider yourself a candidate for an Operator of Uninspected Passenger Vessels (OUPV) 6-Pack license. This license allows you to charter vessels with up to 6 paying passenger and is the first step to a career in the maritime industry, full-time or part-time!
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Опубликовано:

22 дек 2014

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Комментарии : 24

@hankfan75 8 лет назад

just wanted to say thank you for your videos, I passed steersman school at Delgado community college in New Orleans with your help, thank you sir, you are a skilled teacher

@nmi-edu 7 лет назад

We are glad to hear that the videos were helpful. If we can be of other assistance for classes / training do not hesitate to contact us

@dougfitch3649 Год назад

These videos are helping me get through a poorly designed course. I will take my OUPV /6 pack course through NMI thanks to Captain Medeiros and his outstanding videos!

@nmi-edu 6 месяцев назад

Thank you for your feedback!

@aaaaasssa 5 месяцев назад

Very well explained thank you 😊

@jamesyurwitz5450 5 лет назад

Great video, thank you for simplifying.

@iainhunneybell 2 года назад

Don’t forget to allow for state of tide as heights of lights are above MHWS and you will likely be below that, i.e. closer when the light first comes into sight. But wonderful to see the light change from a loom to a light 🙂

@francoismacaire2427 7 месяцев назад

so if MHWS Is 5 metres and Heights of tide is 3metres and Height of eyes 2metres above water level i will be same height than MHWS and see the light at the same range than nominal range??? just checking if I understand

@iainhunneybell 7 месяцев назад

Correct @@francoismacaire2427. So... Height of light = 30m (above MHWS) MHWS = 5m (over chart datum) Current state of tide is 3m (over chart datum), i.e. 2m below MHWS Your height of eye is 2m over height of tide, i.e. height of tide + height of eye = 3 + 2 = 5m So, as you say, your eye is at CD + 5 = MHWS and so the height of light from your observation is 30m ... just as you say 🙂

@francoismacaire2427 7 месяцев назад

@@iainhunneybell thanks for checking! appreciated

@letssail5002 3 года назад

thankyou capt. Dave

@uniquesensitivesnowflake7366 Год назад

Wow thanks. Is it the same as the charted range of the light?

@atakangunes147 3 года назад

Thank you Cap

@dolam7082 2 года назад

Sir, height of object and eye from which water level? MHWS or chart datum?

@arnedebeste007 7 лет назад

Strange that if I use my tables, combined height of eye & &elevation of object, that I get for those values 15.3' Not so acurate if we'd want to plot our position on the card with that help. What's the explenation behind that?

@jorgebartra8970 6 лет назад

I got 16.02 using the Geographic Visibility Distance formula. The video is correct but he is using tables.

@arthuramoguis7671 2 года назад

Sir how about 18 feet sir what the geographic range?

@Creative_Punjabi93 3 года назад

Sir Also By This Method We Check Geographical Range GR = 2.095 (√ Height Of Eye + 2.095 (√ height Of Object In Metres = 1.08 (√ Height Of Eye + 1.08 (√ height Of Object In Feets

@VenuGopal-tt3ee 7 лет назад

Geographical Range = 2.095(√ht of object in metre + √ht of eye) kindly do tell that why do we multiply by 2.095 when in metre and 1.15 when in feet. the values 2.095 or 1.15 where did they come from. pls do reply if possible. thanks n regards.