The lines of secancy are located 180,000 meters east and west of the central meridian of each projected zone.  See Figure 3-6.     DRAFT 3-5 Figure 3-7  Line Distortion and Scale Factor in the Transverse Mercator Projection 3° 3° A' A B M' M C D' D Scale Factor: 1.0   Scale Factor:   0.9996 Scale Factor: 1.0   180,000 Meters 180,000 Meters Scale Factor: 1.001  Approx.   SECANT    LINE SECANT    LINE Scale Factor: 1.001  Approx.   Easting of Starting Station Scale Factor 500,000 500,000 0.9996 490,000 510,000 0.99961 480,000 520,000 0.99961 470,000 530,000 0.99961 460,000 540,000 0.99961 450,000 550,000 0.99963 440,000 560,000 0.99963 430,000 570,000 0.99966 420,000 580,000 0.99966 410,000 590,000 0.99970 400,000 600,000 0.99972 390,000 610,000 0.99975 380,000 620,000 0.99977 370,000 630,000 0.99982 360,000 640,000 0.99984 350,000 650,000 0.99985 340,000 660,000 0.99991 330,000 670,000 0.99995 320,000 680,000 1.00000 310,000 690,000 1.00005 300,000 700,000 1.00009 290,000 710,000 1.00014 280,000 720,000 1.00021 270,000 730,000 1.00025 260,000 740,000 1.00030 250,000 750,000 1.00037 240,000 760,000 1.00044 230,000 770,000 1.00051 220,000 780,000 1.00058 210,000 790,000 1.00064 200,000 800,000 1.00071 190,000 810,000 1.00078 180,000 820,000 1.00085 170,000 830,000 1.00094