With the sea being so unpredictable, there is nothing as important as having accurate information you can trust. When sailing larger boats, instruments are extremely useful in observing conditions in addition to your natural senses. However, sailing instruments do not replace a sailor’s natural instincts, they simply enhance them. Instrumentation should be highly visible and easy to access like our main three - marine binoculars, plotting instruments and sextants.
Optimising vision, binoculars are one of the most important instruments for use on the water. They are required for clarity, brightness and comfort of use which are all essential for accuracy at sea. A point to consider is whether you want waterproof or non-waterproof binoculars to support your needs. The difference is that most waterproof binoculars have an individual-eye focussing system, whereas non-waterproof binoculars usually have a central focus wheel with a separate right eye adjustment to correct for uneven eyesight. Both have their advantages, but because of the environment, moisture or spray is likely to get into any binocular that is not completely sealed. The most common fault on all binoculars will be the movement of the prisms causing double vision or eye strain which can only happen when they have been knocked. You should consider purchasing a much better optical binocular that is well protected in order to give you long-term good service.