การดู
9:16
The Compass: True North vs Magnetic North
5:13
Magnetic Declination Explained | Your Compass Needle Does NOT Point North!
1:59
How to Set Declination on a Compass | Outside TV
2:54
How to find TRUE North without a Compass : using the Shadow Method
6:18
True North on the iPhone Compass App
4:07
True North, Magnetic North, Grid North; Magnetic Declination
7:26
Declination? Find your true declination and make adjustments simple. Map and Compass made Easy
8:31
In and Out Navigation: The Easiest Way to Use a Compass
