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Source: https://outdoors.stackexchange.com/q/8228
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

<p>There are quite a lot of questions concerning GPS device usage, however I couldn't find any specific information on more passive usage (as in waiting for rescue).</p>

<p>Say I have a watch and a phone which both have inbuilt Global Positioning Systems (GPS). When I am stranded in the wilderness, what can I do with them, in order to use them in a most optimal way. </p>

<p>By this I mean, while i'm waiting for search and rescue... for the sake of argument say I cannot use those devices as the actual means of finding my way out, because of some environmental/physical impossibility.</p>

<p>Here are some points which I am interested in, but do not limit your answer to them:</p>

<ul>
<li>Should the device be switched on?</li>
<li>Should the GPS on the device be switched on?</li>
<li>What can I do to prolong battery life?</li>
<li>Is the device useless once the battery is dead? </li>
<li>If I know they are looking for me, would they pick up the signal, if I switch it on for short periods every now and again?</li>
<li>Is it best if I stay in one place (environment permitting) and would it be harder for them if I am on the move?</li>
</ul>