Garmin Models that "Don't Rely on Cellular Signals"
Sat, 06/11/2016 - 6:03pm
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9 years
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This is probably a silly question, but Garmin advertises some of their models as "not relying on cellular signals" How does that differ from other models that do not make this claim? I'm buying someone who lives in an area with very spotty cellular reception a GPS as a gift and am unsure whether or not this would be an advantage. I thought ALL GPS units relied on satellites.
Thanks.
Passive RFIDs work at distances greater than about a foot
I believe my EZ pass uses RFID (it's just a sticker) and those overhead scanners are more than a foot away. Granted they sometimes miss in which case they use your license plate number to debit the account as they take a picture of every car passing the scanner.
EZPass uses 'Active RFID' technology, using active receivers and transmitters, powered by batteries. It's the un-powered RFID 'stickers' that only work from about a foot away.
I live in a gated development and have an un-powered RFID on my car's windshield to raise the barrier. It works at a distance considerably greater than a foot. These passive, unpowered RFID's get enough energy to respond from the signal received from the base transmitter.
Cheaper
I believe my EZ pass uses RFID (it's just a sticker) and those overhead scanners are more than a foot away. Granted they sometimes miss in which case they use your license plate number to debit the account as they take a picture of every car passing the scanner.
EZPass uses 'Active RFID' technology, using active receivers and transmitters, powered by batteries. It's the un-powered RFID 'stickers' that only work from about a foot away. Whenever there's a glitch in the toll system and my transponder doesn't register, they still charge a toll to my account using license plate recognition. I got mine around 2000, but since it is now so easy to just use license place recognition, I wonder why they bother with the dedicated transponders any more.
Because the dedicated responders are always cheaper than LP reading. Check the announced toll rates.
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