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You need at least some comunications means in the car. Some possibilities:
- GSM with SMS (slow updates, super costly sending) or GPRS or UMTS. Cheap to install.
- WIMAX or other long range means comunications. will cost you a bit more to install.
- WIFI. Probably cheapest, but no use out of big cities.
- Radioamateur modem. Free send, receive. Very costly install and needs huge space. You share frequencies with others. Hardest to install.
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