Imprecise Senses
Imprecise senses allow a creature to perceive certain details and clues about the world, which vary depending on the sense, but these are not sufficient for the creature to make out nuanced detail the way a human’s sight does. For many creatures, their nonvisual senses are imprecise. Some creatures have extremely keen imprecise senses that, while still insufficient to provide details like a precise sense would, can greatly help the creatures detect stimuli in the absence of their precise senses; such senses are collectively referred to as “blindsense.”
Source
Core Rulebook pg. 260