New answers tagged

0

It is also worth mentioning that there are other ways to obtain absolute position references by using astronomical observations. Most of these are centuries old and of course, are not anywhere near as convenient and in most cases not as accurate a GPS however they do have the advantage that they don't depend on electronics or batteries to work. The modern ...


31

Compasses are good equipment both spelunking and diving. Even the deepest cave you could go to is still near the earth's surface, geologically speaking. The earth's magnetic field is also essentially the same under water as above. If you are using a compass, what you need to be aware of is nearby magnets and large sources of iron. So if you were exploring ...


0

In poor visibility you need to fall back on the basic navigational techniques of dead reckoning and any terrain features that you can still positively identify and follow. Dead reckoning involved keeping close track of the direction you are walking in and how far you walk. With practice this can be reasonably accurate, especially if you can augment is with ...



Top 50 recent answers are included