You are a member of a space crew originally scheduled to meet up with a mother ship on the lighted side of the moon.  However, due to mechanical problems, your ship was forced to land on a spot 320km from the meeting point.  During re-entry and landing much of the equipment on board was damaged and since survival depends on meeting the mother ship, only the most critical items must be chosen for the 320km trip.

Below are 15 items left intact and undamaged after landing.  Your task is to rank them in order of importance.  Place the most important item at number 1, the second most important at 2 and so on, with the least important at 15.  Read the items carefully and don’t forget you are on the moon!

We will get our experts to calcuate your points once people have posted their answers.  We have the official list compiled by NASA where we will calculate the difference between where you rank the items and where they are ranked in the answers. 

See if you can beat Mr C!!!!!!!  Any parents are more than welcome to post their answers.
15 Items…
Box of matches
Portable heating unit
Self inflating raft
2x50kg oxygen tanks
Pistol
Food concentrate
10kg Dehydrated milk
Stellar Map
FM reciever
Magnetic Compass
2 flares
15m of rope
Silk parachute
20 litres of water
First aid box – including needles