robtillaart:
Thomass1237:
The thing I'm wondering is how I can possibly send 500-1000 bottles with gps cheap.this project raises a lot of questions
first, please define cheap ...
what is your budget?where do you want to drop the bottles?
sea?ocean?river?What communication did you have in mind for the feedback?
Do you want interactive or real time data? (expensive -> GSM option??)
Or do you want to store gps data on a flash card and catch the bottles after a week?
I don not have the budget now. Because if i know what this "project" will cost i know what to ask for 
The thing is i the botles will be released on the west coast of Norway.
The communication i want is not flash card, becaus it can take years for i can find them. I was thinking some thing there I can see on my computer ore website where the botles are. And that them sends signal every 4-5hour for a week or something.