Re: GPS trackers - a potential weapon from hell

PeteS wrote:

1. It's difficult enough to get a GPS lock with a clear view of the sky
from inside a vehicle, even just under the dash, let alone under a
vehicle, and that's with an active antenna (they have LNAs embedded in
the antenna) and the latest GSP units.


What puzzled me when I designed one a couple of years ago, was that the position would often wander, anything up to a hundred metres, and usually about 4 in the morning. 15 minutes later, all was tickety-boo once more.

2. Reporting requires GSM of some description, and if the OP is that
paranoid, simply scan for the known GSM bands. Note GPRS is preferred
over SMS for a number of practical reasons.


Like you can be sure that the message actually arrives within 24 hours.

A silly bug meant that mine, which was meant to re- send the message every hour if not acknowledged, sent it continuously after the first hour. Even at 5p a go, with 11 hoursworth of SMS messages every 30 seconds or so I was glad the customer was paying.

Paul Burke

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