Garmin FORETREX 601 Owner's Manual

Also see for FORETREX 601: User manual

Contents

TIP: You can manually enter the temperature, or you can usethe temperature value from a connected tempe sensor.WIND DIRECTION: The direction from which the wind iscoming. For example, a 9 O'CLOCK wind blows from your leftto right. Input field.WIND SPEED 1: The wind speed used in the shooting solution.Input field.WIND SPEED 2: An optional, additional wind speed used in theshooting solution. Input field.TIP: You can use two wind speeds to calculate a windagesolution that contains a high and low value. The actualwindage to apply for the shot should fall in this range.Target FieldsDIRECTION OF FIRE: The direction of fire, with north at 0° andeast at 90°. Input field.NOTE: The DIRECTION OF FIRE is used only for calculatingthe Coriolis effect. If shooting at a target less than 1,000yards away, this input field is optional.INCLINATION: The angle of inclination of the shot. A negativevalue indicates a downhill shot. A positive values indicates anuphill shot. The shooting solution multiplies the verticalportion of the solution by the cosine of the inclination angle tocalculate the adjusted solution for an uphill or downhill shot.Input field.RANGE: The distance to the target, displayed in YDS (yards) orM (meters). Input field.SPEED: The speed of a moving target, display in mph or km/h.A negative value indicates a target moving left. A positivevalue indicates a target moving right. Input field.Profile Fields, Bullet PropertiesBALLISTIC COEFFICIENT: The manufacturer's ballisticcoefficient for your bullet. Input field.TIP: When you use one of the Applied Ballistics custom dragcurves, the ballistic coefficient will display a value of 1.000.BULLET DIAMETER: The bullet diameter measured in inches.Input field.NOTE: The diameter of the bullet may vary from the commonname of the round. For example, a 300 Win Mag isactually .308 inches in diameter.BULLET LENGTH: The length of the bullet, in inches. Inputfield.BULLET WEIGHT: The bullet weight measured in grains. Inputfield.DRAG CURVE: The Applied Ballistics custom drag curve, or theG1 or G7 standard projectile models. Input field.NOTE: Most long range rifle bullets are closer to the G7standard.Profile Fields, Gun PropertiesHORIZONTAL SIGHT SCALE FACTOR: A linear multiplier thataccounts for horizontal scaling. Not all rifle scopes trackperfectly, so the ballistics solution requires a correction toscale according to a particular rifle scope. For example, if aturret is moved 10 MILS but the impact is 9 MILS, the sightscale is 0.9. Input field.MUZZLE VELOCITY: The speed of the bullet as it leaves themuzzle. Input field.NOTE: This field is required for accurate calculations by theshooting solution. If you calibrate the muzzle velocity, thisfield may be updated automatically for a more accurate firingsolution.OUTPUT UNITS: The output units of measure. MIL (milliradian)is 3.438 inches at 100 yards. MOA (minute of angle) is 1.047inches at 100 yards.SIGHT HEIGHT: The distance from the center axis of the riflebarrel to the center axis of the scope. Input field.TIP: You can easily determine this value by measuring fromthe top of the bolt to the center of the windage turret, andadding half of the diameter of the bolt.TWIST RATE: The distance it takes for the rifling of your barrelto make one full rotation. Rifle twist is often provided by thegun or barrel manufacturer. Input field.VERTICAL SIGHT SCALE FACTOR: A linear multiplier thataccounts for vertical scaling. Not all rifle scopes trackperfectly, so the ballistics solution requires a correction toscale according to a particular rifle scope. For example, if aturret is moved 10 MILS but the impact is 9 MILS, the sightscale is 0.9. Input field.ZERO HEIGHT: An optional modification to impact elevation atzero range. This is often used when adding a suppressor orusing a subsonic load. For example, if you add a suppressorand your bullet impacts the target 1 inch higher thanexpected, your ZERO HEIGHT is 1 inch. You must set this tozero when you remove the suppressor. Input field.ZERO OFFSET: An optional modification to impact windage atzero range. This is often used when adding a suppressor orusing a subsonic load. For example, if you add a suppressorand your bullet impacts the target 1 inch to the left of theexpected impact, your ZERO OFFSET is -1 inch. You mustset this to zero when you remove the suppressor. Input field.ZERO RANGE: The range at which the rifle was zeroed. Inputfield.Profile Fields, Gun Properties, Calibrate Muzzle VelocityENTER RANGE: The distance from the muzzle to the target.Input field.TIP: You should enter a value as close as possible to therange suggested in the shooting solution. This is the rangewhere the bullet slows to Mach 1.2 and begins to enter thetransonic range.ENTER TRUE DROP: The drop in MIL or MOA at the target.Input field.Profile Fields, Gun Properties, Calibrate Drop Scale FactorENTER RANGE: The range from which you are shooting. Inputfield.TIP: This range should be within 90% of the recommendedrange suggested in the shooting solution. Values that areless than 80% of the recommended range will not provide avalid adjustment.ENTER TRUE DROP: The drop in MIL or MOA of the bulletwhen fired at range. Input field.Appendix 11

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