To locate 270° azimuth (due west) for core drilling using a compass clinometer, follow these steps: 1. Stand at the drill collar position (the point where the hole will start). 2. Hold the compass flat at waist level and steady; make sure it’s level and away from metallic objects (rods, boots, rig parts) that could affect the magnetic needle. 3. Allow the needle to settle, then rotate the compass housing until the “270°” mark aligns with the direction-of-travel arrow or sighting line on the comp