Quickleaf
Legend
Before I make my first post, I need to ask for some clarification. Rex has a general purpose scanner, it can detect motion out to 500 meters, life forms out to 1500 meters and comms signals out even further. Knowing that they are in danger, he would be using it to keep watch on their surrounding areas, what would he have picked up so far?
Ah, thanks for catching that. I'll revise my opening post...
What Rex's scanner would first pick up is an upsilon-encrypted Resistance comm beacon (which he could sense since Spirepoint's gate). Additionally, his scanner would pick up a lot of "white noise" of various comms in use around Spirepoint.
Coming within ~2km of the ruined temple, he would sense unusual garbled communications that would require a Difficulty 2 Computers check (with two Setback dice) to decipher.
During the journey out to the ruined temple through the rainforest he would detect many animal lifeforms, and intermittently he'd detect some "phantom images" of what could be humanoids at the far edge of his sensors.
Within 1.5km of the ruined temple he would detect 9 humanoids intermittently jumping north on his sensors. The "jumping" would be due to the fact that the creatures were moving (beyond the range his sensors detect movement) rainforest terrain creating interference.
Within 500m of the ruined temple he would detect 8 humanoids milling about one who appeared stationary.
Does that seem like what a droid's sensors would pick up?