Detecting with Other Senses

Most abilities that designate “a creature you can see” or the like function just as well if the user can precisely sense the subject with a different sense. If a monster uses a sense other than vision, the GM can adapt ways of avoiding detection that work with the monster's senses. For example, a creature that has echolocation might use hearing as a primary sense. This could mean its quarry is concealed in a noisy chamber, hidden in a great enough din, or invisible under a silence spell.

Using Stealth With Other Senses

The Stealth skill is designed to use Hide for avoiding visual detection and Avoid Notice and Sneak to avoid being both seen and heard. For many special senses, a player can describe how they're avoiding detection by that special sense and use the most applicable Stealth action. For instance, a creature stepping lightly to avoid being detected via tremorsense would be using Sneak.
In some cases, rolling a Dexterity-based Stealth skill check to Sneak doesn't make the most sense. For example, a PC trying to avoid being detected by a creature that senses heartbeats might meditate to slow their heart rate, using Wisdom instead of Dexterity for their Stealth check. When a creature could detect you using multiple different senses, use your lowest applicable attribute modifier.