Target Card Fields

DIRECTION OF FIRE

The direction of fire, with north at 0 degrees and east at 90 degrees. Input field.

INCLINATION

The angle of inclination of the shot. A negative value indicates a downhill shot. A positive value indicates an uphill shot. The shooting solution multiplies the vertical portion of the solution by the cosine of the inclination angle to calculate the adjusted solution for an uphill or downhill shot. Input field.

RANGE

The distance to the target, displayed in yards or meters. Input field.

SPEED

The speed of a moving target, displayed in miles per hour (mph), kilometers per hour (km/h), or meters per second (m/s). A negative value indicates a target moving to the left. A positive value indicates a target moving to the right. Input field.

Range Card Fields

DROP

The total drop the bullet experiences along its flight path, displayed in inches or centimeters.

ELEVATION

The vertical portion of the aiming solution, displayed in inches, milliradians (mrad or mil), or minute of angle (MOA).

ENERGY

The remaining energy of the bullet at target impact, displayed in foot-pounds of force (ft. lbf.) or joules (J).

H COR

The horizontal Coriolis effect. The horizontal Coriolis effect is the amount of the windage solution attributed to the Coriolis effect. This is always calculated by the device, although the impact may be minimal if you are not shooting at extended range.

LEAD

The horizontal correction needed to hit a target moving left or right at a given speed.

TIP: When you enter the speed of your target, the device factors the necessary windage required into the total windage value.

SPIN DRIFT

The amount of the windage solution attributed to the spin drift (gyroscopic drift). For example, in the northern hemisphere, a bullet shot out of a right-hand twist barrel will always deflect slightly to the right as it travels.

TOF

The time of flight, which indicates the time required for a bullet to reach its target at a given range.

V COR

The vertical Coriolis effect. The vertical Coriolis effect is the amount of the elevation solution attributed to the Coriolis effect. This is always calculated by the device, although the impact may be minimal if you are not shooting at extended range.

VEL MACH

The estimated velocity of the bullet when it impacts the target, displayed as a factor of mach speed.

VELOCITY

The estimated velocity of the bullet when it impacts the target.

WINDAGE 1

The horizontal portion of the aiming solution based on the wind speed 1 and wind direction, displayed in inches, milliradians (mrad or mil), or minute of angle (MOA).

WINDAGE 2

The horizontal portion of the aiming solution based on the wind speed 2 and wind direction, displayed in inches, milliradians (mrad or mil), or minute of angle (MOA).

Environment Fields

AMB/STN PRESS.

The ambient (station) pressure. Ambient pressure is not adjusted to represent sea level (barometric) pressure. Ambient pressure is required for the ballistics shooting solution. Input field.

TIP: You can manually enter this value, or you can select the USE CURRENT AMB./STN. PRESS. option to use the pressure value from the internal sensor in the device.

HUMIDITY

The percentage of moisture in the air. Input field.

LATITUDE

The horizontal location on the Earth's surface. Negative values are below the equator. Positive values are above the equator. This value is used to calculate the vertical and horizontal Coriolis drift. Input field.

TIP: You can select the USE CURRENT LATITUDE option to use the GPS coordinates from your device.

NOTE: The LATITUDE is used only for calculating the Coriolis effect. If you are shooting at a target less than 1,000 yards away, this input field is optional.

TEMPERATURE

The temperature at your current location, displayed in degrees Fahrenheit (F) or Celsius (C). Input field.

TIP: You can manually enter this value, or you can select the USE CURRENT TEMPERATURE option to use the temperature value from the internal sensor in the device.

WIND DIRECTION

The direction from which the wind is coming. For example, a 9:00 wind blows from your left to your right. Input field.

WIND SPEED 1

The wind speed used in the shooting solution, displayed in miles per hour (mph), kilometers per hour (km/h), or meters per second (m/s). Input field.

WIND SPEED 2

An optional, additional wind speed used in the shooting solution, displayed in miles per hour (mph), kilometers per hour (km/h), or meters per second (m/s). Input field.

TIP: You can use two wind speeds to calculate a windage solution that contains a high and low value. The actual windage to apply for the shot should fall within this range.

Profile Fields: Bullet Properties

BALLISTIC COEFFICIENT

The manufacturer's ballistic coefficient for your bullet. Input field.

BULLET DIAMETER

The bullet diameter, displayed in inches or centimeters. Input field.

NOTE: The diameter of the bullet may vary from the common name of the round. For example, a 300 Win Mag is actually .308 inches in diameter.

BULLET LENGTH

The length of the bullet, displayed in inches or centimeters. Input field.

BULLET WEIGHT

The bullet weight, displayed in grains (gr) or grams (g). Input field.

DRAG CURVE

The G1 or G7 standard projectile models for drag curve. Input field.

NOTE: Most long range rifle bullets are closer to the G7 standard.

Profile Fields: Gun Properties

MUZZLE VELOCITY

The speed of the bullet as it leaves the muzzle, displayed in feet per second (ft./sec.) or meters per second (m/s). Input field.

NOTE: This field is required for accurate calculations by the shooting solution. If you calibrate the muzzle velocity, this field may be updated automatically for a more accurate firing solution.

SIGHT HEIGHT

The distance from the center axis of the rifle barrel to the center axis of the scope, displayed in inches or centimeters. Input field.

TIP: You can easily determine this value by measuring from the top of the bolt to the center of the windage turret, and adding half of the diameter of the bolt.

SSF ELEVATION

A linear multiplier that accounts for vertical scaling. Not all rifle scopes track perfectly, so the ballistics solution requires a correction to scale according to a particular rifle scope. For example, if a turret is moved 10 mil but the impact is 9 mil, the sight scale is 0.9. Input field.

SSF WINDAGE

A linear multiplier that accounts for horizontal scaling. Not all rifle scopes track perfectly, so the ballistics solution requires a correction to scale according to a particular rifle scope. For example, if a turret is moved 10 mil but the impact is 9 mil, the sight scale is 0.9. Input field.

TWIST RATE

The distance it takes for the rifling of your barrel to make one full rotation, displayed in inches or centimeters. Rifle twist is often provided by the gun or barrel manufacturer. Input field.

ZERO HEIGHT

An optional modification to impact elevation at zero range. This is often used when adding a suppressor or using a subsonic load. For example, if you add a suppressor and your bullet impacts the target 1 inch higher than expected, your ZERO HEIGHT is 1 inch. You must set this to zero when you remove the suppressor. Input field.

ZERO OFFSET

An optional modification to impact windage at zero range. This is often used when adding a suppressor or using a subsonic load. For example, if you add a suppressor and your bullet impacts the target 1 inch to the left of the expected impact, your ZERO OFFSET is -1 inch. You must set this to zero when you remove the suppressor. Input field.

ZERO RANGE

The range at which the rifle was zeroed, displayed in yards or meters. Input field.

Profile Fields: Calibrate Muzzle Velocity

RANGE

The distance from the muzzle to the target, displayed in yards or meters. Input field.

TIP: You should enter a value as close as possible to the range suggested in the shooting solution. This is the range where the bullet slows to Mach 1.2 and begins to enter the transonic range.

TRUE DROP

The actual distance the bullet falls while in flight to the target, displayed in milliradians (mrad or mil) or minute of angle (MOA). Input field.

Profile Fields: Calibrate Drop Scale Factor

RANGE

The range from which you are shooting. Input field.

TIP: This range should be within 90% of the recommended range suggested in the shooting solution. Values that are less than 80% of the recommended range will not provide a valid adjustment.

TRUE DROP

The actual distance the bullet falls when fired at a specific range, displayed in milliradians (mrad or mil) or minute of angle (MOA). Input field.