G. Instructions for Care Tahiti 7X50 Binoculars 1. To protect the binoculars, store them in their case and keep them in a dry area. 2. Clean the lenses with a soft, lintless cloth when needed. 3. Any remaining dirt or smudges can be removed by adding a drop or two of isopropyl alcohol to the cloth. Waterproof Fog-proof For use in any weather Internal rangefinder scale & bearing compass Very Important It is not necessary to clean binoculars internally. Attempting to take binoculars apart or clean them internally will result in damage. Caution Do not use this product to view the sun. Looking directly into the sun, with or without binoculars, can cause permanent eye damage. 1 3 6 Instructions for Use 8 2 9 5 7 4 Fig. 1 Main Features: Fig. 2 • Waterproof, dust-proof, all-weather binoculars are suitable for use in all conditions. Ideal for rugged activities such as watersports and mountaineering. • Nitrogen gas inside the binoculars eliminates fogging and mold on the internal lens surfaces, even during severe weather conditions. • Internal rangefinder scale and bearing compass with illumination switch indicates the distance or size of objects being viewed, along with their direction. • Hi-index Bak-4 prism creates a bright, sharp image with vivid contrast, providing a clear view of objects. • Rubber-coated body provides great shock resistance and a comfortable grip. 1-800-BOATING www.westmarine.com Binocular Parts (Fig. 1 & 2) 1. Rubber eyecups 2. Adjustable eye-piece diopter 3. Main body 4. Objective lens 5. Compass housing 6. Compass light switch 7. Battery compartment 8. Center focus knob 9. Strap holders A. Eyepiece Distance Adjustment For best viewing, the binoculars should be adjusted for the individual user so that eyepieces line up with the user’s eyes: 1. Hold the binoculars in a normal viewing position. 2. Grasp each barrel firmly. While looking through the binoculars, adjust the barrels until you see a single, circular field of view. Reset the binoculars to this position each time you use them. The eye distance setting is indicated on the scale located on the binocular hinge. B. Diopter Setting and Center Focus 1. Set the right eyepiece (2) to zero and look at a distant object. 2. Keeping both eyes open, cover the right objective (front) lens with your hand, then adjust the center focus wheel until an image in the left eyepiece appears sharp. 3. Cover the left objective (front) lens with your hand, then rotate the right eyepiece until the image appears sharp again. 4. Diopter setting is now correct for your eyes, and you need only adjust the center focus to view objects at different distances. Note the diopter setting for future use. C. Roll-down Eyecups To use binoculars while wearing eyeglasses or sunglasses, roll down the eyecups (1). This will allow you to bring your eyes closer to the binoculars, improving your field of view. D. Floating Strap Prior to water activities, make sure the floating strap is securely attached to the binoculars. This strap is designed to keep binoculars afloat if they are dropped into the water. E. Reading the Rangefinder Scale The rangefinder scale is a useful navigation tool if you know the size or distance of an object. If you know an object’s size, you can use the rangefinder to calculate its distance. Conversely, if you know the object’s distance, the rangefinder can tell you its size. 1. To measure distance, simply apply the following formula: Distance = 100 x Object Height Rangefinder Scale Reading Example: if the object is 20 meters high and the rangefinder scale reading is 1.6 (Fig. 3), then: 20 M (height) x 100 = 1,250 M (distance) 1.6 (rangefinder scale reading) 2. To measure size, the formula becomes: Fig. 3 Object Size = Distance x Rangefinder Scale Reading 100 Example: if the object is 1,250 meters away and the rangefinder scale reading is 1.6, then: 1,250 M (distance) x 1.6 = 20 M (object size) 100 F. Using the Bearing Compass 1. To read the bearing compass: When you look through the left eyepiece, you will see a bearing compass window with figures and graduations below the field of view. The bearing compass shows directions as angles: north is 0º, east is 90º, south is 180º and west is 270º. Each graduation mark in the compass represents 1º. To determine an object’s direction, first align the object with the rangefinder scale in the center of the field. Then read the compass, reading the graduation mark that lines up with the reference line in the center of the bearing compass. Note: the compass is oriented to “magnetic north,” which differs from “true north.” True north is the same throughout the world, while magnetic north varies depending on location. 2. To locate your position: These binoculars, together with a map and protractor, can be used to locate your position. For example, the binoculars plus the map in Fig. 4 could be used to determine the location of a boat sailing within the map’s area. a. First, from the boat, use the binoculars to locate the buoy shown on the map. In this example, the bearing compass would show that the buoy is located 190º from the boat. Fig. 4 b. Use this information to determine the direction from the buoy to the boat. (To do this, subtract 180º if the object’s reading is 180º or greater; add 180º if the reading is less than 180º.) So, 190º (direction from boat to buoy) - 180º = 10º (direction from buoy to boat). c. On the map, draw a line from the buoy extending in a 10º direction (10º from magnetic north). You now know your boat is somewhere along this line (Fig. 5). d. To determine your boat’s exact position, use the binoculars to locate a second object, the lighthouse. The bearing compass will show that the direction from your Fig. 5 boat to the lighthouse is 300º. e. Then calculate the direction from the lighthouse to your boat: 300º - 180º = 120º. f. Finally, draw a line extending 120º from the lighthouse (Fig. 6). Your boat is located at the point where the two lines intersect. 3. Compass light: To read your compass in the dark, press the compass light switch (6), which will illuminate it in red light. If the light becomes faint, change the light battery (LR43 X 2, alkaFig. 6 line batteries). Unscrew the cover of the battery compartment (7) and change the battery.
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