Bomb Sniffer
From Inkipedia, the Splatoon wiki
Bomb Sniffer is an ability that allows you to see Ink Mines that are hidden by opponents. All bombs within a certain distance appear as skull icons on your screen. These skull icons can be seen through walls. This Ability is restricted to shoes as a main ability.
In-Depth Ability
Use
Bomb Sniffer is used to track down nearby Ink Mines that have been placed by the enemy. This does not activate or expire and is a permanent ability that can last the whole match. Ink Mines are marked as skulls as mentioned before and can be shot down or avoided to allow safer passaging through the map.
Gear
Bomb Sniffer is the main ability of: