Seiko V657 Manual - Page 9

English TACHYMETER [for models with tachymeter scale on the dial] To measure the hourly average speed of a vehicle: Tachymeter scale: 90 1 Use the stopwatch to determine how many seconds it takes to go 1 km or 1 mile. 2 Locate the second marker on the main dial which corresponds to the number of seconds measured. The number on the tachymeter scale indicates the average speed per hour. * For the models with the tachymeter scale around the small dial at the 6 o'clock position, read the tachymeter scale which the STOPWATCH second hand points to. q Tachymeter scale can only be used to measure average speed when time required is up to 60 seconds. STOPWATCH second hand: 40 seconds If the measuring distance is extended to 2 km or miles or shortened to 0.5 km or miles and STOPWATCH second hand indicates "90" on the tachymeter scale: "90" (tachymeter scale figure) x 2 (km or miles) q Ex. : "90" (tachymeter scale figure) = 180 km/h or mph x 1 (km or mile) = 90 km/h or mile/h "90" (tachymeter scale figure) x 0.5 (km or miles) = 45 km/h or mph 9