The Astra IIIB is considered by many to be the easiest sextant to use. Its light weight and excellent balance makes it a pleasure to hold and makes sights. If you want to buy it so A1 IB can provide you best quality of nautical sextants according to your requirement. A1 IB is today a trusted name in the marine supply industry. The company is made up of passionate people who support their core values of providing a high level of service and solutions tailored to their customer’s needs. Contact us now.