Image of Brunton GEO Transit in closed position, in hand.

GEO Pocket Transits

• Adjustable needle locking mechanism with two positions: Unlocked - releases the needle for azimuth readings. Locked - momentary release of the needle for strike measurements by pressing and holding the release mechanism, then lock the needle for reading by releasing the mechanism.
• Hinge clinometer with 2° increments for 1° readable dip measurements
• Two long-level bubbles on the outside of the aluminum housing for no guess leveling from the sides or bottom
• Cover hinge assembly designed for increased durability
• 'Buck Horn' style sight for increased accuracy when sighting azimuth or vertical angles
• Single NdFeB magnet resists demagnetization better than other types of magnets
• Azimuth accuracy +/- 1/2° with 1° graduations and 10 minute readability
• Vertical angle accuracy to +/- 1/2° with 1° graduations and 10 minute readability
• Vertical angle measurements to +/-90° or 100% grade
• Percent grade scale with increments of 5%
• Induction dampened needle for quick, accurate readings
• Sapphire jewel bearing allows for smooth needle movement
• Magnetic declination adjustment allows for east or west declination settings to 180°
• Precision aligned mirror with convenient 'see-through' sighting capability
• 6061-T6 hard anodized aluminum body for permanent color and scratch resistance
• Waterproof
• Leather case
• Lifetime warranty

5010 pictured above.
5009 is same except outer ring is in 90°quads

A. Round Level
For accurate azimuth measurement, dip direction and trend measurements, center the bubble in the round level.

B. Needle
The needle is attached to a rare earth magnet which is induction damped, which allows the needle to seek magnetic north and come to a complete rest in a minimum amount of time, without accuracy degradation.

C. Graduated Circle
In combination with the needle, the 1° graduated circle allows for azimuth readings that are accurate to 1/2 degree.

D. Long Level
The long level for inclination measurement. For accurate inclination measurement, center the bubble in the long level using the vernier adjustment.

E. Rare Earth Magnet
Brunton has incorporated a cast NdFeB, rare-earth magnet which seeks magnetic north very quickly and allows for faster needle settling.

F. Zero Pin
The zero pin is the pointer used for magnetic declination adjustment. If no adjustment is necessary, the pin should point at 0° on the azimuth ring.

G. Needle Release Mechanism- 2 Positions
Unlocked: When needle locking adjustment is unlocked the needle swings freely, even when the needle release
   mechanism is pressed.
Locked: When needle locking adjustment is in the locked position the needle is locked in place until the needle
   release mechanism is pressed.

H. Vernier
The vernier is used for inclination measurements with an accuracy to 30 minutes.

I. Mirror
Located on the inside cover, the mirror and mirror center line are used for accurate azimuth measurements, when using the transit as a prismatic compass. (Note: The image in the mirror is of the ceiling of our shop)

J. Small Sight
Attached to the cover, the small "buckhorn" style sight is used for precise bearing and inclination sighting.

K. Large Sight with Peep Sight
The large sight and the attached "buckhorn" style peep sight are used for precise azimuth measurement.

L. Ball and Socket Tripod Mount
The slots on both sides of the body are for mounting to an optional Brunton tripod.

M. Magnetic Declination Adjustment Screw
Adjust the GEO Transit for magnetic declination, by turning the declination adjustment screw using a flat head screwdriver

N. Vernier Adjustment
Use the vernier adjustment to adjust the vernier and long level for inclination measurements.

O. Needle Locking Adjustment
Adjust the needle locking lever to lock and unlock the needle.

P. Side/Bottom Long Levels:
When it is not possible to view the round level, use side/bottom, long levels to level the GEO transit for azimuth and inclination measurement.

Q. Hinge Inclinometer:
Measure inclination using the lid and at least one of the three bubbles.