Leupold GX-6c User manual

OPERATING INSTRUCTIONS
GX®-6c
RANGEFINDER

TABLE OF CONTENTS
Introduction ............................................ 01
About Leupold & Stevens, Inc. ............................ 02
Accuracy ............................................... 03
How GX Rangefinders Work .............................. 03
GX Rangefinder Specifications............................ 06
Operation .............................................. 07
Cleaning/Maintenance ................................... 26
Warranty/Repair ........................................ 27
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INTRODUCTION
Congratulations on your purchase! Your new Leupold® GX-6c
rangefinder has been crafted by our engineers and designers to
outperform the competition and provide you with years of solid
performance on the course. To ensure proper function for the life of
the product, please review the following instructions detailing the
correct use of your GX digital laser rangefinder before operating.
The GX-6c is a revolutionary device that uses a ballistic algorithm
and advanced digital electronics to guarantee accurate ranges
on the course. The DNA® (Digitally eNhanced Accuracy™) engine
easily ranges the longest par 5 using advanced signal processing
techniques, while the True Golf Range™ (TGR®) algorithm provides
hit-to distances accurate to less than a yard on high and low
angled shots. Intelligent Flag Lock technology identifies the pin
from the obstacles around it, like trees and bushes, and uses the
information to locate and lock on to the pin. Additional features
include a bright red display, PinHunter 3 technology, Image
Stabilization, Prism Lock, Club Selector, and an inclinometer.
The GX-6c provides the same incredible durability, ruggedness,
and speed of our other GX rangefinders, while delivering
improved accuracy and efficiency so you can golf with total
confidence, shot after shot.

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ABOUT LEUPOLD & STEVENS, INC.
It’s a decidedly American story: in 1907, a young German immigrant named
Fred Leupold set up a one-man shop at 5th and Oak Streets in Portland,
Oregon, repairing optics for surveying equipment. The small company
survived the First World War and the Great Depression. But it was the
Second World War that would forever change the company. Working
with the U.S. Army on a riflescope and the Navy on optics for use aboard
ships, the engineers at Leupold learned the secrets of waterproofing and
durable construction that would completely change the world of sports
optics. Leupold & Stevens, Inc. is still family-owned, though the focus has
turned from land surveying to helping people across the globe survey their
environments with innovative, high-performance optics and accessories.
Leupold optics are renowned for their unchallenged ruggedness, and
their vastly superior optical quality. A century of observation and optical
experience has gone into every product we produce, and we think the
results are well worth the extra effort required to achieve this level of quality.
In true American style, the philosophical foundation laid in our early years
has served us well as we’ve grown and changed over the decades. In fact,
the firm’s founder established the clarity of purpose that we see at Leupold
& Stevens, Inc. today:
“We solemnly promise never to let down on quality, the customer is entitled
to a square deal.” — Markus Friederich “Fred” Leupold

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ACCURACY
The ranging accuracy of the GX-6c series of rangefinder is +/-
.5 yard/meter. The maximum effective range depends upon a
number of factors including lighting conditions and air quality,
but the most important factor is the reflectivity of the target.
For most objects, the maximum distance is 450 yards, while for
highly reflective targets (such as pin prisms), distances of 800
yards can be obtained.
HOW IT WORKS
The Leupold GX-6c rangefinder emits a series of invisible,
infrared energy pulses that reflect off the selected target and
the surrounding objects, like trees and bushes. State-of-the-
art circuitry and precision computing circuits determine which
object is the pin and calculate the distance instantaneously by
measuring the time it takes for each pulse to travel from the GX
rangefinder to the pin and back.
MAXIMUM RANGE
CONDITION GX-6c
Reflective Target (yd/m) 800/731
Trees (yd/m) 700/640
Pin/Flag (yd/m) 450/411

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Surface texture, color, size, and shape of the target all affect
reflectivity, which in turn affects the maximum range of the
rangefinder. As a rule of thumb, brightly colored targets are
much more reflective than darker targets, with black being
the least reflective color. A shiny surface is more reflective
than a dull surface. Smaller targets are more difficult to range
than larger targets. Light conditions, haze, fog, rain, and other
environmental conditions can all affect ranging performance.
Any factor which degrades air clarity will reduce the maximum
effective range. Bright light shining directly on the lenses
reduces the effectiveness, producing shorter maximum ranges
than those possible on darker (overcast) days. The steadier the
GX unit is held, the greater the maximum distance.
SAFETY AND OPERATION
PRECAUTIONS
The Leupold GX-6c 6x22mm rangefinder employs an eye safe
laser in its operation. Even so, there are a few precautions that
are important to remember:
• Do not depress the POWER button while aiming at a human
eye or while looking into the optics from the objective side.
• Do not leave the GX within the reach of small children.

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• Do not take the product apart as it has a self-protection device
in the electronic control module and may cause an electric
shock.
• Do not attempt to use any power source other than a CR123A
battery (or equivalent) — the GX is designed to prohibit
accessing any other external power supply.
• Read this instruction manual in its entirety before using this
rangefinder. If the product is used in a manner not specified by
the manufacturer, the protection provided by the equipment
may be impaired.
• Caution: Use of controls or adjustments or performance of
procedures other than those specified herein may result
in hazardous radiation exposure.
• When you see the display through the eyepiece, please be aware
that the product is active and emitting an invisible laser and the
laser aperture should not be pointed toward anyone.
(Display as seen through the eyepiece)
GX-6c Display (TGR off)GX-6c Display (TGR on)

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SPECIFICATIONS
The GX-6c digital laser rangefinder provides a variety of useful
modes to tailor performance to the conditions you experience in
the field. Model features are identified on the following pages.
GX-6c
Magnification 6x
Inclinometer (Selectable for USGA rule 14-3/0.5) Yes
TGR®(True Golf Range™) (Selectable for USGA rule 14-3/0.5) Yes
Club Selector (Selectable for USGA rule 14-3/0.5) Yes
Image Stabilization Yes
Quick Set Menu Yes
Line of Sight Distance Yes
Yards/Meters Yes
Fog Mode Yes
Flag Lock Yes
Prism Lock Yes
1-Touch Scan Mode Yes
Battery Life >4000 Actuations
Weight 8.0 oz
Dimension (Inches) 4.0L x 3.0H x 1.6W
Low Battery Indicator Yes
Warranty 2 Years
Waterproof Yes

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OPERATION
QUICK SET MENU™
*GX-6c display shown with all possible characters visible

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The GX-6c has two buttons: POWER and MODE. When you
initially press the POWER button, the display is activated and the
unit is ready for ranging. Press the POWER button a second time
to range, or press and hold the POWER button to scan. Scanning
automatically updates the display. When ranging long distances
without a steady rest, you can easily differentiate the pin from
other potential targets behind it.
When you press and hold the MODE button for 2 seconds
and then release it, the Quick Set Menu is activated. To set or
activate a mode, you must advance to that function by pressing
the MODE button until that function is displayed. To activate or
manipulate a function, press the POWER button as necessary. If
this is the last function to be set, allowing the rangefinder to sit
idle for 30 seconds will cause an automatic power-off, saving all
MODE BATTERY
FOCUS
POWER
TGR INDICATOR

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selections. If additional set up is required, simply Press MODE
to continue through the Quick Set Menu. Pressing and holding
MODE for at least 2 seconds at any time will exit the Quick Set
Menu, save all previous changes, and prepare the rangefinder
for immediate use. To reset your GX-6c to factory settings, press
POWER to activate the unit. With the rangefinder activated,
press and hold MODE, then immediately press and hold POWER.
After the 13-second timer shown in the display reaches zero, the
rangefinder will return to factory settings.
The TGR Indicator (red LED) turns on when the rangefinder is
being used in non-conforming TGR mode. Use of the GX-6c for
tournament play is permitted when Local Rule is in effect (see
USGA Decision 14-3/0.5), and TGR is turned off. To conform to
USGA rule, ensure the TGR Indicator is turned off.
DISPLAY INTENSITY
This mode is used to adjust the brightness of the
display, allowing you to match the intensity to
current conditions. Your GX-6c has three display
intensity settings; low, medium, and high.
Navigate through the Quick Set Menu by
pressing and releasing the MODE button until
“dISP” is shown in the upper display. Press and

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release the POWER button to toggle between high, medium, and
low. Press MODE to save the selection.
FOG MODE
The Fog Mode can be used in foggy/rainy
conditions to screen out false readings from
raindrops or other atmospheric interference to
provide an accurate range. Fog Mode changes
the algorithm to look for the “last” target. To
increase ranging accuracy always range the
ground around the pin/flag when Fog Mode is on.
TO ACTIVATE FOG MODE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 2 seconds and then release
to enter the Quick Set Menu; the word “Fog” will now appear
in the upper display.
3) While the word “Fog” is displayed, press and release POWER
as necessary until the word “On” is displayed in the lower
portion of the display.
4) To save the changes and return to ranging mode, let the unit
sit idle for at least 30 seconds until an automatic power-down
occurs, or simply press and hold MODE for at least 2 seconds.
To continue through the Quick Set Menu and manipulate

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another feature, press and release MODE until the appropriate
icon is displayed.
NOTE: There is no icon for Fog Mode in normal operation. When
powered on the unit will display Fog On/OFF status to remind
you of the current setting. We recommend turning Fog Mode off
during normal ranging to enable easy location of the pin/flag.
TRUE GOLF RANGE (TGR)
True Golf Range is an adjusted range that
will compensate for uphill shots that play
long and downhill shots that play short. TGR
is calculated from the line-of-sight distance,
incline or decline, current temperature and
altitude, and will display the adjusted range
the golfer should play to. For example, if you
have a lie 150 yards from the pin, but the green falls 6 degrees

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above your ball, you should play the shot as if it
were 164 yards.
NOTE: Turning TGR off will also disable the Club
Selector and inclinometer display; all distance
readings will be line-of-sight measurements.
TO ACTIVATE TGR:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 2 seconds and then release
to enter the Quick Set Menu; press and release MODE one
more time to advance to TGR mode.
3) While TGR is shown in the upper portion of the display, press
and release POWER as necessary until “On” is shown in the
lower portion of the display.
4) To save the changes and return to ranging mode, let the unit
sit idle for at least 30 seconds until an automatic power-down
occurs, or simply press and hold MODE for at least 2 seconds.
To continue through the Quick Set Menu and manipulate
another feature, press and release MODE until the appropriate
mode is displayed.

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DAY OF PLAY TEMPERATURE INPUT (dP)
Temperature is one of the factors used to determine
TGR ranges; inputting the current temperature will
increase the accuracy of your TGR measurement.
The default temperature setting is 75 degrees °F
(25 degrees °C).
NOTE: If yards is selected as the desired measurement output,
the temperature will automatically be measured in Fahrenheit. If
meters is selected, the temperature will be measured in Celsius.
MANUALLY INPUT THE DAY OF PLAY TEMPERATURE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 2
seconds and release to enter the Quick Set
Menu.
3) Verify that TGR is turned on; if TGR is not
activated, you will not be able to enter
the current temperature. See “To Activate
TGR:”.
4) Press and release MODE until the temperature is displayed.
5) Press and release MODE until “dP” flashes briefly in the
display, followed by the temperature flashing in the display.

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6) While the temperature is flashing, press and release POWER
to change the current temperature setting to match the
current conditions. Each depression of POWER will increase
the temperature setting by 5 degrees until 120 degrees °F
(50 degrees °C) has been reached, at which time the setting
will return to 30 degrees °F (0 degrees °C) and begin
increasing again.
7) To save the changes and return to ranging
mode, let the unit sit idle for at least 30
seconds until an automatic power-down
occurs, or simply press and hold MODE for
at least 2 seconds. To continue through the
Quick Set Menu and manipulate another
feature, press and release MODE until the
appropriate icon is displayed.
DAY OF PLAY ALTITUDE INPUT (dP)
Altitude is one of the factors used to determine TGR ranges;
inputting the local elevation/altitude will increase the accuracy of
your TGR measurement. The default altitude setting is 1000 feet,
and will be shown in the lower portion of the display.
NOTE: Altitude is always measured in feet.

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MANUALLY INPUT THE DAY OF PLAY ALTITUDE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 2 seconds to enter the
Quick Set Menu.
3) Verify that TGR is turned on; if TGR is not activated, you will
not be able to enter the current altitude. See “To Activate
TGR”.
4) Press and release MODE until “Alt” is displayed.
5) While the altitude is flashing, press and release POWER
to change the current altitude setting to match current
conditions; each depression of POWER will increase the
altitude setting by 500 feet until 9999 has been reached,
at which time the setting will return to 0 and begin
increasing again.
6) To save the changes and return to ranging mode, let the unit
sit idle for at least 30 seconds until an automatic power-down
occurs, or simply press and hold MODE for at least 2 seconds.
To continue through the Quick Set Menu and manipulate
another feature, press and release MODE until the appropriate
icon is displayed.

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CLUB SELECTOR
NOTE: If TGR is not activated, you will not be able to use the
Club Selector feature.
When TGR is activated, the Club Selector function recommends
the proper iron for the current distance, shot angle,
environmental conditions, and multiple other factors. This will
be shown in the lower portion of the display. When ranging an
object with True Golf Range activated, the upper display will
show the TGR distance, and the lower display will show the
line-of-sight distance briefly, followed by the word “club”,
followed by the club recommendation. The True Golf Range will
remain visible in the upper portion of the display.
TO ACTIVATE CLUB SELECTOR:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 2 seconds to enter the
Quick Set Menu.

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3) Verify that TGR is turned on; if TGR is not
activated, you will not be able to enter club
selections. See “To Activate TGR”.
4) Press and release MODE until “club”
is displayed.
5) While “club” is shown in the lower portion
of the display, press and release POWER as
necessary until “On” is shown in the upper
portion of the display.
6) To save the changes and return to ranging mode, let the unit
sit idle for at least 30 seconds until an automatic power-down
occurs, or simply press and hold MODE for at least 2 seconds.
To continue through the Quick Set Menu and manipulate
another feature, press and release MODE until the appropriate
mode is displayed.
Critical to accurate club recommendations is the known striking
distance of the user with specific clubs. By inputting the actual
distance obtained with a few clubs, a specialized algorithm
accurately determines the distance obtained with others.
The actual distance obtained from an 8-iron, 6-iron, and 4-iron
shot should be input as accurately as possible.
If no club distance is input, the Club Selector will automatically
default to the preset distances (130 yards for an 8-iron, 150 yards