The motherboard carrying the processor is the smallest 'gum'-sized board on top of the slightly larger expansion board which carries the GPS receiver, audio. and connectors. To upload files we had to use the serial connection (USB didn't work with this combination of boards, and there were other problems with bluetooth), Jorgen made a beautiful hidden connector that sits between the two boards. The whole thing is secured tightly by waxed string. The next stage was covering in rubber shrink-wrap - material that shrinks when heated to protect electronics, which gives the final form of the satellite sounders.
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