A GPS is a … Electronic instrument to determine a location based on information it receives from satellites Stands for “Global Positioning System” Is the electronic replacement for compasses in determining location Is the electronic replacement for astronomy in determining location
The Recreational GPS When powered on will take several minutes to “lock onto” satellites. These satellites are 11,000 miles in orbit Used to find Longitude and Latitude To map data To make maps To find the car To find a prize But for a variety of reasons
What To Do Math – Finding Areas, Measuring Distances History – Studying Columbus or Lewis & Clark Geography
Longitude and Latitude http://www.hammondmap.com/sites/hammond/geography/latlong1.html
http://kids.earth.nasa.gov/archive/nino/global.html Trade Winds - About thirty degrees north & south of equator. Prevailing Westerlies - Between thirty & sixty degrees latitude, winds that move toward poles appear to curve to east. Winds are named from direction they originate. Easterlies - About sixty degrees latitude (both hemispheres) prevailing westerlies join with polar easterlies to reduce upward motion. Polar easterlies form when atmosphere over the poles cools. Cool air sinks & spreads over surface. As air flows away from poles, is turned to the west by Coriolis effect. Global Wind Patterns
Trade Winds http://www.ucalgary.ca/applied_history/tutor/eurvoya/index.swf 5400 miles, in 36 days, in 1492
Figuring the Lines of Longitude http://worldatlas.com/aatlas/imageg.htm
Longitude & Latitude of the U.S. http://rockyweb.cr.usgs.gov/outreach/gps/UTM_Zones_USA48.jpg
Now That You’re Worldly, You Need To Run The Numbers
Reading A GPS 3 Formats hemisphere degrees, minutes, seconds hemisphere degrees, minutes hemisphere degrees hemisphere degrees, minutes, seconds 33 07’ 03”N 87 07’ 02” W 33 o 07’ 03”N 87 o 07’ 02” W hemisphere degrees, minutes 33 07’ 043”N 87 07’ 02”W 33 o 07’ 043”N 87 o 07’ 02”W hemisphere degrees 33 11.735N 87 11.718W 33 11.735 o N 87 11.718 o W
Conversions 1035.75 miles between latitude lines 69.05 miles between 1 degree of latitude 1.15 miles between minutes .019 miles between seconds; which equals100 feet and 3.5 inches.
However it’s a Sliding Scale At 38 degrees North latitude one degree of latitude equals approximately 364,000 ft (69 miles), one minute equals 6068 ft (1.15 miles), one-second equals 101 ft. one-degree of longitude equals 288,200 ft (54.6 miles), one minute equals 4800 ft (0.91 mile), and one second equals 80 ft.
I Need You To Cosign Cosine Open the calculator in Windows (Start Programs Accessories Calculator) Click on View & Scientific Choose Decimal and Degrees Type in known latitude Click the Cosine Key (cos) Multiply answer by 69
Ideas Mapping to figure area Solving problems to get the co- ordinates to find a geocach Tracing Expeditions http://www.lewis-clark.org/ http://www.americanwest.com/ trails/pages/ponyexp1.htm