APPENDIX C

UNITS OF MEASURE AND CONVERSION FACTORS

ENGLISH SYSTEM OF LINEAR MEASURE

12 inches	=	1 foot
36 inches	=	1 yard
3 feet	=	1 yard
1,760 yards	=	1 mile statute
2,026.8 yards	=	1 mile nautical
5,280 feet	=	1 mile statute
6,080.4 feet	=	1 mile nautical
63,360 inches	=	1 mile statute
72,963 inches	=	1 mile nautical

METRIC SYSTEM OF LINEAR MEASURE

EQUIVALENT UNITS OF ANGULAR MEASURE

CONVERSION FACTORS

Example I

Problem:	Reduce 76 centimeters to (?) inches.
	76 cm x 0.3937 = 29 inches
Answer:	There are 29 inches in 76 centimeters.

Example II

Problem:	How many feet are there in 2.74 meters?
Answer:	There are approximately 9 feet in 2.74 meters.

GROUND DISTANCE AT MAP SCALE

Scale	1 Inch Equals	1 Centimeter Equals
1:5,000	416.67 feet	164.0 feet
	127.00 meters	50.00 meters
1:10,000	83333 feet	328.1 feet
	254.00 meters	100.00 meters
1:12,500	1,041.66 feet	410.1 feet
	317.00 feet	125.00 meters
1:20,000	1,666.7 feet	656.2 feet
	508.00 meters	200.00 meters
1:25,000	2,083.3 feet	820.2 feet
	635.00 meters	250.00 meters
1:50,000	4,166.7 feet	1,640.4 feet
	1,270.00 meters	500.00 meters
1:63,360	5,280.0 feet (1 mile)	2,078.7 feet
	1,609.30 meters	633.60 meters
1:100,000	8,333.3 feet	3,280.8 feet
	2,540.00 meters	1,000.00 meters
1:250,000	20,833.0 feet	8,202.0 feet
	6,350.00 meters	2,500.00 meters
1:500,000	41,667.0 feet	16,404.0 feet
	12,700.00 meters	5,000.00 meters