Need help with high altitude balloon

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i've been trying read , understand topic of high altitude ballooning, boy confusing. i'm trying coach kids science fair project. 

we need:
the balloon, parachute, payload container, 'chute , rigging (check, understand this)

here's i'm confused , hope folks willing out.
i need build aprs station. there's called tracuino (sp?) that's build onto arduino, or in addition it? 
i want track following info during flight (3-4 hours):
temperature
altitude (if it's not culled air pressure)
air pressure
location

i guess that's it. i'm looking build shopping list. need buy thing off ground?
am making sense?
thanks help.

a important thing decide how weigh. determine size of balloon , how helium need buy. there several web sites estimate everything.

you can buy or build inexpensive aprs trackers. need amateur radio operators license , call sign operate 1 legally. if there aprs repeater close enough balloon path , connected internet, tracking data appear on http://aprs.fi under call sign.

 or, can use satellite locator such spot. hab tracking overview.


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