China Suppliers hot sale Outdoor Lensatic Hiking Military pocket lensatic Compass with protector

Floating disc in liquid filled chamber.

True north adjustment requires an angle adjustment called magnetic delclination, it varies over time and position on earth. Best to remember the declination for your area of operations. When sailing and charting you have a true north compass star which helps for orientation. On military maps and USGS maps they typically have arrows that indicate true north, grid north (can't draw hemispheric curved lines on flat paper) and magnetic north. Most good maps are orientated true north up. Always check on that. 

No. The north indicator(luminescent) is on the dial internal to the compass, along with the degrees (90°, 270° etc)The dial moves pointing north. You guide by using the bezel with the 2 lines on the glass. Position your direction of travel between those 2 lines. 

Yes,it is non-magnetic.

Hello, thank you so much for your question. There will be no problem for you to use the compass in South America and with a instruction about the compass come with the package for you reference. You can also get in touch with us to get an instruction in large print as well. Hoping this will be helpful.