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Results tagged with compasses
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user 9109
Compasses are a navigational instrument utilising a magnetized needle giving a frame of reference based on North, South, East and West, as well as their intermediate directions such as SE, NW etc. This is based on Magnetic North, and not True or Grid North.
4
votes
Is there an easy way to remember if you add magnetic declination to magnetic bearings or tru...
There's a mnemonic: Can Dead Men Vote Twice At Elections?
The first letters in this sentence indicate the meaning: Compass +/- Deviation = Magnetic +/- Variation = True (Adding Easterly).
This means …
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13
votes
Accepted
How to identify latitude & longitude with a compass?
You need something else.
You need a sextant and a marine chronometer (a fancy watch). The sextant measures the inclination of a star or the sun, and helps to determine latitude. Once you know that, …
- 5,188
4
votes
Can a compass be thrown off by its surroundings?
The OP provides an nicely detailed self answer, but I would like to add that when such areas exist, they are of particular concern to mariners1, and are therefore well-documented for nautical navigati …
- 5,188
17
votes
Accepted
I have a compass but no watch, how can I tell when it will get dark?
You don't need a compass, nor any mechanical tool at all. You just need your fingers. I've linked an article with illustrations at the end, but here is the basic idea:
Stand facing the sun, extend …
- 5,188
7
votes
Accepted
What is head/lift indication in a digital compass on a sailboat?
Let's start with the terms lift and header. Suppose I want to go that way, whichever direction that happens to be. If the wind is coming from that way, then I can't do it, at least not on wind power …
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