1. RADIOSONDES SAMPLING THE UPPER ATMOSPHERE

2. EARLY MET KITE INCLUDED SENSORS, DATA RECORDER

3. METEOROGRAPH ALSO INCLUDED SENSORS, DATA RECORDER

4. AIRCRAFT MET 1925 AIRCRAFT INSTRUMENTED WITH MET SENSORS/RECORDER

5. PILOT BALLOON 1930 PILOT BALLOON RELEASE

6. 1936 RADIOSONDE NEWLY DEVELOPED TRANSMITTERS ENABLED BALLOON LAUNCHES

7. EARLY ANTENNA 1955 NWS RADIOSONDE TRACKING ANTENNA SYSTEM

8. RADIOSONDE PREP PREPARING RADIOSONDE AND BALLOON FOR LAUNCH

9. RADIOSONDE TYPICAL CURRENT RADIOSONDE

10. BALLOON LAUNCH RADIOSONDE LAUNCH CAPE CANAVERAL

11. BALLOON ALOFT RADIOSONDE, BALLOON, AND PARACHUTE ALOFT

12. JIMSPHERE LAUNCH JIMSPHERE LAUNCH CAPE CANAVERAL

13. MET DATA PLOT TYPICAL PLOT OF TEMPERATURE, PRESSURE, AND HUMIDITY

14. WIND DATA PLOT TYPICAL PLOT OF WIND DIRECTION COMPONENTS

15. TEMP. PLOT TYPICAL PLOT OF TEMPERATURE VERSUS ALTITUDE

16. HUMIDITY PLOT TYPICAL PLOT OF HUMIDITY VERSUS ALTITUDE

17. HUMIDITY PLOT TYPICAL PLOT OF HUMIDITY VERSUS ALTITUDE

18. GPS SATELLITE GLOBAL POSITIONING SYSTEM

19. HOW GPS WORKS PRECISE POSITION DETERMINED BY MEASURING THE ARRIVAL TIMES OF SIGNALS FROM AT LEAST FOUR GPS SATELLITES

20. GPS ORBITS ORBITAL PLANES OF CURRENT 24 SATELLITE GPS CONSTELLATION

21. XBT EXPENDABLE BATHYTHERMOGRAPH PROBE MEASURES OCEAN TEMPERATURES