- When you leave the house, leave a note stating when you're leaving, where you intend to go, and when you intend to be back. Loved ones and police often have a hard time knowing where to start when someone disappears while jogging or running errands. Even if you live alone, this isn't a bad idea.
- Maintain phone contact. Send the occasional text just to establish a paper trail. If someone is already suspected missing, keep calling his or her phone as long as it continues to ring. If the phone is moving (i.e. in a car) the cell towers will help map those movements. However, it is also important to keep in mind the fact that when the battery runs down, the phone can no longer be located.
- KEEP YOUR PHONE CHARGED.
- Clearly document your tattoos (if applicable).
- Take a snapshot if you don't have any recent pictures lying around, particularly if you've changed your look.
- If you're the one left behind, make the police file a missing person's report ASAP. Don't be put off by the "it hasn't been long enough" excuse. Be the squeaky wheel.
That should be enough for starters.