Introduction
This manual provides instructions for the proper use and maintenance of your AOFAR AF-M2-B Multifunctional Military Geological Compass. This compass is designed for precision navigation and geological surveying in various outdoor conditions.
Package Contents
Verify that all items are present in the package:
- 1 x AOFAR AF-M2-B Compass
- 1 x Pouch and Lanyard
- 1 x Carabiner
- 1 x User Manual (this document)
Product Features
The AOFAR AF-M2-B compass incorporates several features for enhanced functionality and durability:
- Durable ABS Construction: Built with robust Acrylonitrile Butadiene Styrene (ABS) material for longevity.
- Needle Lock: Secures the compass needle during transport to prevent damage.
- Magnetic Declination Adjuster: Allows for simple compensation of magnetic declination.
- Vertical Angle Clinometer: Features a 90-degree range with 1-degree increments for measuring slopes and elevations.
- Waterproof and Shockproof Design: Ensures reliable performance in challenging outdoor environments.
- Fluorescent Dial: Provides visibility in low-light conditions.
- Bubble Levels: Includes both circular and cylindrical bubble levels for accurate leveling.
- Sighting Mirror with Lubber Line: Aids in precise bearing measurements.
- Induction Damped Needle: Ensures quick and stable readings.
- Adjustable Sighting Points: For improved accuracy in targeting.
- 360-Degree Scale: Standard compass scale for comprehensive navigation.
Figure 1: AOFAR AF-M2-B Compass in its closed, compact state.
Figure 2: AOFAR AF-M2-B Compass opened, displaying the internal components for navigation and measurement.
Setup
- Unpack the Compass: Carefully remove the compass, pouch, lanyard, and carabiner from the packaging.
- Attach Lanyard: Secure the lanyard to the compass for easy carrying and to prevent loss.
- Release Needle Lock: Before use, ensure the needle lock is disengaged to allow the compass needle to move freely. The needle lock protects the compass assembly during transport.
- Check Bubble Levels: For accurate readings, ensure the compass is level. Use the circular and cylindrical bubble levels to achieve a flat surface.
Operating Instructions
1. Taking a Bearing
- Open the Compass: Fully open the compass lid until it forms a 90-degree angle with the base.
- Align Sighting Mirror: Position the compass at eye level. Use the sighting mirror and the sighting line (lubber line) to align with your target.
- Level the Compass: Use the built-in bubble levels to ensure the compass is perfectly horizontal. This is crucial for accurate readings.
- Read the Bearing: Once the needle has settled (approximately 15 seconds due to induction damping), read the bearing indicated by the needle on the 360-degree dial.
2. Adjusting for Magnetic Declination
Magnetic declination is the angle between magnetic north (where the compass needle points) and true north. This value varies by location and can be found on topographical maps or online resources.
- Determine Declination: Find the magnetic declination for your current location.
- Use Declination Adjuster: Locate the magnetic declination adjuster on the compass. Rotate it to set the correct declination value. This will compensate for the difference between magnetic and true north, allowing you to read true bearings directly.
3. Using the Clinometer (Vertical Angle Measurement)
The clinometer measures vertical angles, useful for determining slopes or heights.
- Position the Compass: Hold the compass on its side, aligning the edge with the slope or object you wish to measure.
- Read the Clinometer Scale: The internal clinometer scale will indicate the vertical angle in 1-degree increments, with a range of 90 degrees.
Maintenance
- Cleaning: Wipe the compass with a soft, damp cloth. Avoid abrasive cleaners or solvents that could damage the ABS material or markings.
- Storage: Store the compass in its protective pouch when not in use. Engage the needle lock before storing or transporting to protect the needle assembly.
- Avoid Magnetic Fields: Keep the compass away from strong magnetic fields (e.g., magnets, electronic devices, metal objects) as they can affect accuracy or magnetize the needle over time.
- Temperature: Avoid exposing the compass to extreme temperatures for prolonged periods.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Needle does not move freely or points incorrectly. | Needle lock engaged, nearby magnetic interference, or compass not level. | Disengage needle lock. Move away from electronic devices or metal objects. Ensure compass is level using bubble levels. |
| Readings are inconsistent. | Compass not level, rapid movement, or strong winds. | Ensure compass is stable and level. Allow needle to settle completely (approx. 15 seconds). Shield from strong winds if necessary. |
| Fluorescent markings are dim. | Insufficient light exposure. | Expose the compass to bright light (sunlight or artificial light) for a few minutes to recharge the fluorescent material. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | AF-M2-B |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Product Dimensions (L x W x H) | 7.87 x 4.57 x 10.92 cm |
| Weight | 120 grams |
| Needle Damping Time | 15 seconds |
| Dial Graduation | 1° |
| Cylindrical Bubble Level Accuracy | 15'± 5'/2mm (at 20℃) |
| Circular Bubble Level Accuracy | 30 ± 5 mm/2 mm |
| Clinometer Range | 90 degrees (1-degree increments) |
| UPC/GTIN | 706352590595 |
Warranty and Support
AOFAR provides a limited 2-year warranty for the AF-M2-B compass, covering manufacturing defects. Additionally, AOFAR offers lifetime customer service support for this product.
For warranty claims or technical assistance, please contact AOFAR customer service through their official website or the retailer where the product was purchased.
