The OSS 30B Baseplate Compass from Brunton is a lightweight and durable baseplate-style compass for day hikes. This cost-effective navigation device features Brunton's proprietary alignment system and includes tool-free declination adjustments, two degree resolution, and mineral oil filled housing for more precise headings and reliable readings. Brunton Outdoor Group has been designing and manufacturing compasses since their establishment in 1894; whether you are a bird watcher, hunter, or hiker, Brunton has been making gear for nature enthusiasts like you for over a century.