We are humans and we like to go to different places. There are times when we need to make our location known (voluntarily), to friends, relatives or partners for meeting them at a specific place, for assistance when we have a problem or fun when we find a special beach, shop, event, etc.
Just send a message to them and, provided they use WAMII too, a map will automatically be created (with verbal assistance too) so they can come and join you, effortlessly, without you having to loose time explaining any details. Also, you may "mark" your current position when you find a place you want to visit at a later time or leave your car or anything else you need to pick up or do at a later time. The uses are just too many to list.
This service uses Apples Maps native application so it complies to relevant country / territory limitations.