General Navigation - Departure
Hi. I am having a problem working out this, please tell me where I'm wrong.
Q: What is the distance between 00500W and 01000E at a latitude of 35°S? So I have to find the East-West distance between 500' W of Prime Meridian and 1000'E of PM. That adds up to 1500' difference between the two meridians. Departure = D Long cos Lat 1500 cos 35 = 1228.72 nm Ok that was my working, here's the brief explanation in the book: D Long = 15 x 60 = 900’ 900 cos 35 = 900 x .819 737 nm Where did that 15degrees come from? Isn't that supposed to be 25 (1500' / 60 = 25 ) Please enlighten me. Thanks. |
One degree is 60 minutes, not 100.
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I am aware of that, as you can see in my previous post (1500 (minutes) / 60 = 25nm) Anyone get my question?
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It's 5degrees west to 10 degrees east which in my book is 15degrees. It's not 1500' it's 900' (15*60).
In the question it should be written as 05,00W and 10,00E i.e. 5degrees 0minutes west and 10degrees 0minutes east |
Originally Posted by Resident Insomniac
Anyone get my question?
Originally Posted by Resident Insomniac
I am aware of that
Originally Posted by towser
In the question it should be written as 05,00W and 10,00E i.e. 5degrees 0minutes west and 10degrees 0minutes east
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Thank you guys. I thought 00500W and 01000E were given in minutes, but nevertheless they are ambiguous, or is that another way of writing coordinates?
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There are several conventions for writing latitude and longitude but usually a five digit group will be DDDMM followed by E or W for longitude; latitude only needs four digits (DDMM) as it will not exceed 9000.
Incidentally, the answer you give is a rhumb-line distance along the same latitude. The GC distance between those points will be less. |
Thank you!
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