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A magnetic declination of +8 deg (east) means that 8 deg is added to true north to get magnetic north. Therefore true north is 8 deg west of magnetic north. When facing to the north, true will be 8 deg to the left of magnetic. Same at the south, true S will be 8 deg to the left of magnetic S.
(I always struggle to remember which is which but I believe I am correct unless what I just read online is not).
At Ayers Rock Airport (YAYE) the magnetic declination is 3.87 deg, about half of that at Adelaide). YAYE is approx. 6km from Uluru.
There are many free compass apps that also give you true bearings. I would rather trust a good oil filled orienteering compass but whichever compass you use keep it away from your mount when taking a bearing to avoid any influence from the mount.
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