You Are a Member of an Apollo Flight Scheduled to Land at the Lunar Base on the Lighted

You are a member of an Apollo flight scheduled to land at the lunar base on the lighted side of the moon. Due to mechanical difficulties, however, you and your partner were forced to land at a spot some 300 kilometers from the lunar base, while the third member of the crew continued to orbit in the Command Module. During the landing, much of the equipment on board was damaged and, since survival depends on reaching the lunar base, the most critical items available must be chosen for the 300 kilometer trip.

Listed below are the 15 items left intact and undamaged after landing. Your task is to rank them in terms of importance for your crew in allowing them to reach the lunar base. Place a number 1 by the most important item, the number 2 by the second most important, and so on through number 15, the least important.

Item / Your Ranking / Group Ranking / Expert Ranking
Box of matches
Food concentrate
15 meters of nylon rope
Parachute
Portable hearing unit
.45 caliber pistol
Case of dehydrated milk
Two 100 pound tanks of oxygen
Moon Constellation map
Self-inflating life raft
Magnetic compass
20 liters of water
Self-igniting signal flares
First aid kit with hypodermic needles
Solar-powered FM transmitter