Compact Size The all new Nautilus GPS is less than half the size of our original radio and is incredibly simple to use. Easy to attach to a BCD or tuck into a pocket. No MMSI & Registration No special or dedicated base units required.  No registration, subscriptions or service fees required.  Positively Buoyant Your Nautilus GPS floats! It is waterproof in all sea conditions. Waterproof Nautilus GPS is waterproof. It is depth...