How to set 航線偏差&方向?

Hong Kong Hiking Web: 討論組 Forum: 行山資料分類 Hiking Subtopics: 裝備 Equipment: 人造衛星定航儀 GPS: 討論 Discussion: How to set 航線偏差&方向?
   By edward018 on Tuesday, June 01, 2004 - 11:22 pm:  Edit

方向用自動, 真北, 定網格?

   By Kin on Monday, June 07, 2004 - 12:19 pm:  Edit

I guess "自動" means magnetic north. Your GPS unit determine the Magnetic North automatically base on your global position, and make a auto-correction base on the data.

I think, if you always use your GPS with a compass, choose "Magnetic North"/"Automatic". Otherwise, it is highly perferable to choose "Grid North" if you want to reference it with a map.

Anyway, the magnetic north difference with the ture north difference is not significant in Hong Kong, which is about 2 degrees. So I always ignore this factor. However, the north difference in some places (e.g. North America) is more higher. So please check the map before you use. If the detail is not available, use "Ture North"/"Grid North" for accuracy navigation

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