Step 1: realize the Situation
- Make yourself clear with what just happened.

Step 2: current Position
- Try to gather as much information about your geographical position. Remember roadsigns, known geographical patterns. Memorize them.
- Try to figure out how far from the last civilized point you are and how far from the next one.

Step 3: Inventory
- Make an inventory of all items you currently have with you. This includes Water, Bottles (empty/filled), Food, Rope, String, Tools to create and keep a fire, clothing, and things usable for defense.


Step 4: How long does it take to get noticed as 'missing'
- Who knows currently where you came from and where you wanted to go?
- Try to remember all scheduled contacts/appointment for at least the next two weeks.
- With whom will you have the appointments and what`s the most probable action for those contacts if you don`t show up?

Step 5: Moving or not.
- What are the weather conditions? Have you equipment in the inventory to wear them off?
- Have you water and equipment to carry it?
- How far is the last or next point of civilization?
- What are the terrain conditions? (rocky, hills, mountains, swamp)
- Is there any route that directly leads to the next or last point of civilization?
- How are the chances to get spotted on that route?
- What is the condition of others?
- Have you means to track your path? (Paper/Pencil, Compass etc) ?

Step 6: Signals
- Have you any means of signals?
- If you have a rough measure of when others notice you`re missing: are there means to create and keep a signal going (smoke/fire, rocks etc).


(just some basic thoughts - comments/edits very welcome.)