"The sensors have picked up several small subspace 'hiccups' over the past few hours," Riker said.

"It's possible that their sensors can't pick us up either through that screen," Spock said.

"My sensors aren't picking it up at all well."

She approved of Lieutenant Hines' attention to detail, although it didn't sound like his sensors had actually picked up much.

"The sensors have picked you up," Stone said.

But why hadn't the sensors picked any of this up?

Our sensors might not have picked it up if they had not been following you.

A sensor on a receiver picks this up and reconverts it first into electrical information then into sound.

Our sensors picked you up while your plane was flying.

If you wander into the wrong section, the sensors will pick you up and off go the alarms.