Whenever you leave your vehicle and venture away from the comforts of civilization there are some essentials to consider.
Listed below are a few links that should be read before walking away from your vehicle and into the out of doors.
 
What should be in your day pack or fanny pack?
 
The Ten Essentials
 
The 10 essentials for a safe and pleasant hike
 
More about the 10-Essentials
 
What should you wear?
 
All About Clothing Layering Systems
 
How to Layer Outerwear
 
How do I use my compass and GPS unit?
 
How to use a compass.
 
How to use UTM and my GPS.
 
and the most important use for your GPS is to mark the position of your vehicle.
No, matter how short the hike. You can imagine the feelings of relief when you lose your way, get caught in a whiteout or just happen to be out after dark and all you have to do is fire up the GPS and you know what direction to travel to reach your vehicle.
Carry spare batteries for your GPS unit.
 
Should I take my cell phone?
Yes, but understand that you may not have cell service.
 
Let someone know where you are going and when you expect to return.
If you get lost and don't return, someone will know enough to alert the authorities.