Re: Help needed with Auxiliary Unit related ideas for children aged 7 - 15.
I would suggest something like map making - get them drawing maps, then reading them.
Teach them to use a compass.
Compass work - using a compass get them to walk out on a compass bearing. You could hide something or somebody some distance on a set bearing.
Develope this so that they can follow a route. Split them into teams to make it competitive. Follow a circular route via check points or signs.
When I was in the Army in Malaya we were sent out from our jungle camp on a bearing for 1000 yards - after about 50 we looked back but could not see the camp. We continued on the bearing. Noted what was at our destination then turned around on the reverse bearing (i.e - 180 degrees). We were being very careful and would have missed the camp completely but luckily someone in the silenced camp coughed which gave their position away.