From Manufacturer
The 7x50 Commander Global Binoculars with Compass from Steiner are a serious boating instrument. They are built for a lifetime of rough seafaring environments, with simply brilliant optical and mechanical performance that lasts and lasts.
Continuing upon Steiner's 7x50 class, the most important innovation with the Commander Global is a precise global compass specially designed for the needs of yacht owners in international waters. No calibrating or adjusting is necessary. The integrated electronic magnetic field measurement ensures precise readings anywhere in the world. The compass lens is extremely rugged thanks to the Makrolon housing.
Precision lenses and an innovative high-tech Diamond-Marine-Coating offers superb optical performance and light transmission combined with the Sports-Auto-Focus. The Commander Global has an optical coating on the objective and eyepieces called NANO Protection. This hydrophobic coating repels moisture and dirt, leaving lenses clear. Like a windshield wiper for your binoculars, you'll find that you'll rarely need to wipe them clean.
The Steiner Commander Global is nitrogen purged and externally sealed, with each unit individually submerged to assure waterproofing. They are tested to resist water pressure down to a depth of almost 33 feet / 10 meters.