Found whilst gratuitously surfing http://www.nps.gov/bela/html/morebear.html The following is an extract of the advice given if you see a bear. The principle is: avoid being in contact with bears if you can. Give the bear every opportunity to avoid you. If you do encounter a bear at close distance, remain calm. Attacks are rare. Chances are, you are not in danger – most bears are interested only in protecting food, cubs or their “personal space.” Once the threat is removed, they will move on. Remember the following:

Identify Yourself – Let the bear know you are human. Talk to the bear in a normal voice. Wave your arms and help the bear recognize you. If a bear cannot tell what you are, it may come closer or stand on its hind legs to get a better look or smell. A standing bear is usually curious, not threatening. You may try to back away slowly diagonally, but if the bear follows, stop and hold your ground.

Don’t Run – You can’t outrun a bear. They have been clocked at speeds up to 35 mph, and like dogs, they will chase fleeing animals. Bears often make bluff charges, sometimes to within 10 feet of their adversary, without making contact. Continue waving your arms and talking to the bear. If the bear gets too close, raise your voice and be more aggressive. Bang pots and pans and use noisemakers. Never imitate bear sounds or make a high-pitched squeal.

Surrender – If a brown bear actually touches you, fall to the ground and play dead. Lie flat on your stomach, or curl up in a ball with your hands behind your neck. Typically a brown bear will break off its attack once it feels the threat has been eliminated. Remain motionless for as long as possible. If you move, a brown bear may return and renew its attack and you must again play dead. If you are attacked by a black bear, fight back vigorously.