This chapter describes how Hamas operatives set up tactical observation posts during the First Intifada, the years after the Oslo Accord, and the Second Intifada, and explores the systematization of this activity after Israel’s withdrawal from the Gaza Strip. Eventually, Hamas established the murabitun, a border patrol force that staffs observation posts and serves as the first responder to any Israeli incursion, and instituted an observation section of the ʿIzz al-Din al-Qassam Brigades, the military wing of Hamas. The members of the latter section used more advanced equipment than had previously been deployed and documented their findings for in-depth analysis. This chapter also describes Hamas’s efforts to develop and operate unmanned aerial vehicles (UAVs) for observation missions.