"The Compass" by Edd Vick
A tale about what kind of sacrifices people have to make and who has to make them. A ship can travel light-years by going through 'skipspace' (a kind of hyperspace) but the only way to navigate is through the use of a foetus which can sense where the earth is. Problem is, the foetus is dying and a new one is needed. But choices are limited for the ship was escaping from Earth moments before its destruction and not many women of child-bearing age were on board. The doctor on board has to help to make this decision if they are to find a new world to settle but she herself may have a hard choice to make.
- Read from Asimov's Science Fiction, July 2005 issue