What does the "Sentry" order do?

[HEMAN]

tesco samoa, your so right about STARS, I enjoy a game with patroll with ranges too.Especially when you have a lot of ships you need patroll intercept. Without patroll it will give a big headach if player must move every other ship of hundreads to thousands if multiple enemys would jump multiple systems or in surprize systems belonging to me. Would be helpful in se4 too even fighters on patroll.