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Using the Compass
READING: When you look into the eyepiece, you will see a compass window with figures and lines below the field of view. The
compass shows orientations as angles: north is 0°, east is 90°, south is 180° and west is 270°. Between numbers, each line
represents 1°. After aligning the object with the rangefinder scale in the center of the field, read the compass.
LOCATING YOUR POSITION: These binoculars, together with a chart and protractor, can be used to
locate your position. For example, the binoculars plus the map in Fig. 3 could be used to determine the
location of a boat sailing within the map' s area:
1. From the boat, use the binoculars to locate the buoy shown on the chart (Fig.3). In this example,
the compass would show that the buoy is located 190° from the boat.
2. Use this information to determine the direction from the buoy to the boat. (To do this, subtract 180°
if the object' s reading is 180° or greater; add 180° if the reading is less than 180°.) So, 190°
(direction from boat to buoy) - 180° = 10° (direction from buoy to boat).
3. On the map, draw a line from the buoy extending in a 10° direction (10° from magnetic north). You
now know your boat is somewhere along this line (Fig. 4).
4. To determine your boat' s exact position, use the binoculars to locate a second object, the
lighthouse. The compass will show that the direction from your boat to the lighthouse is 300º.
5. Then calculate the direction from the lighthouse to your boat: 300°- 180° = 120º.
6. Finally, draw a line extending 120° from the light-house (Fig. 5). Your boat is located at the point
where the two lines intersect.
Compass Light
[400C]
To read your compass in the dark, press the compass light switch (8) to illuminate it in red light.
Batteries
[400C]
Two batteries (included) are required to operate the compass light. To install: unscrew the battery cover (9) on the
underside of binoculars' main body. Install the two batteries, positive (+) side facing up, and screw the cover back into
place. All of the following batteries are suitable for use with your 400C binoculars: AG12, GP186, LR43, and 1176A.
Instructions for Care
To protect the binoculars, store them in their case and keep them in a dry area. Never leave them out in direct sunlight (such
as on a car dashboard) for long periods of time. Avoid banging and dropping.
Extremely Important Note
It is not necessary to clean binoculars internally. Any attempt to take the binoculars apart or clean them internally will result
in damage and void the warranty.
[400C]
westmarine.com
1-800- BOATING
4
Fig. 3
Fig. 4
Fig. 5
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