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Consider for a moment the geography of Oahu--it's an is... 

North, South, East and West do not have lots of meaning on the island of Oahu. Sure, there are some references to these points-of-the-compass: The North Shore is famous for its large trend scan and West Oahu is booming with development, but you are a lot more likely to hear the term Windward Oahu than you are East Oahu and we have not started discussing the local conditions for course of mauka, makai, ewa and Diamond Head. 

Consider for a moment the landscape of Oahu--it's an island, surrounded by water (clearly) that rises from sea level around its shore line to a series of mountain ridges in its heart. Diamond Head is a prominent coastal landmark located on the Southern-most level of the area. These characteristics are what're employed for directions and navigation by those folks who was raised on the island of Oahu. No searching for moss privately of the tree. Number sun rises in the East and Sets in the West nonsense. Directions are simple and direct. You are able to get Mauka (towards the mountains) or Makai (towards the ocean). It is possible to go Diamond Head (towards Diamond Head crater) or Ewa (away from Diamond Head crater). Because irrespective of where you are on the island, you can almost always begin to see the ocean, the hills and, at the very least until recently, Diamond Head using these geographical guns to get from point A to point B make sense. 
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To those folks who spent my youth on Oahu this really is simple, clear to mention and easy to understand. It is only once you try to explain it to someone not really acquainted with the island's online idea that it begins to get confusing. As an example, let us say that you're standing in the city of Kailua on the Windward side (east side) of the island, facing North then plainly Makai would be on your right (or east) and Mauka would be on your left (or West). Ewa would also be on your left (or West) and Diamond Head would be to your Southwest. Now let's say that you're at Pearl Harbor in West Oahu and again facing North then ipso facto Makai would now be on your left (or west) and Mauka would be on your right (or east.) You would be in Ewa and Diamond Head would be to your Southeast. Now, let us place you facing North while in Haleiwa on the North Shore of Oahu. Makai would now be North: Mauka, Diamond Head and Ewa would all be to the South--see how simple this is to understand by? Finally, let us maybe you have standing in Diamond Head Crater on Southern Oahu and facing North. Makai is now to the South, Mauka is to the North, you're in Diamond Head and Ewa is always to the Northwest. With just a little practice and you'll be able to get around like you lived on Oahu your entire life. If you were to operate a vehicle round the area in a direction makai would always be on your own left but at varying moments would be to the West, South, East and North. Equally, mauka would always be on your own right and at different times would be to the North, South, East and West.