That would depend on where you live UK or US

G41 and G42 are dependent on the direction you are traveling clockwise or counterclockwise

This should help to explain it :-

O0001 (COMP G41 AND G42)

G21 G40

G91 G28 X0 Y0 Z0

(OUTSIDE CW)

G54 G00 G90 G43 X-19.445 Y35.91 Z25. H3 S2500 M3

G00 Z1.

G01 Z-1. F500.

G01

G41 D23 X-5.303 Y14.697 F800. S2500

G03 X0. Y12.5 R7.5

G02 X10.827 Y-6.248 R12.5

G02 X-10.827 R12.5

G02 X0. Y12.5 R12.5

G03 X5.303 Y14.697 R7.5

G01 G40 X19.445 Y35.91

G00 Z25.

(INSIDE CW)

G00 X46.25 Y3.75

G00 Z1.

G01 Z-1. F500.

G01

G42 D23 X50. Y12.5 F800. S2500

G02 X60.827 Y-6.248 R12.5

G02 X39.173 R12.5

G02 X50. Y12.5 R12.5

G01 G40 X53.75 Y3.75

G00 Z25.

(INSIDE CCW)

G00 X53.75 Y-46.25

G00 Z1.

G01 Z-1. F500.

G01

G41 D23 X50. Y-37.5 F800. S2500

G03 X39.173 Y-56.248 R12.5

G03 X60.827 R12.5

G03 X50. Y-37.5 R12.5

G01 G40 X46.25 Y-46.25

G00 Z25.

(OUTSIDE CCW)

G00 X19.445 Y-14.09

G00 Z1.

G01 Z-1. F500.

G01

G42 D23 X5.303 Y-35.303 F800. S2500

G02 X0. Y-37.5 R7.5

G03 X-10.827 Y-56.248 R12.5

G03 X10.827 R12.5

G03 X0. Y-37.5 R12.5

G02 X-5.303 Y-35.303 R7.5

G01 G40 X-19.445 Y-14.09

G00 Z25.

G91 G28 Y0 Z0

M30