<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Radio Frequency :)<br>
<br>
<blockquote cite="mid:cb4.29d32138.34d4a5d7@aol.com" type="cite"><font
id="role_document" color="#000000" face="Arial" size="2">
<div>RF? please explain: rear fender?</div>
</font></blockquote>
<br>
Standard GPS (as far as I know) is a read-only service, meaning a
device may query a satellite for it's own location, but no data may be
sent TO the satellite, and the GPS protocol will only send to your
device it's own location, not a list of locations.<br>
<br>
For GPS to work, the satellite would need to be redesigned to not send
the querying device it's own location, but a list of locations of other
devices near the querying device.<br>
<br>
With RF, one could simply create a device similar to an
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/RFID">http://en.wikipedia.org/wiki/RFID</a><br>
<br>
A vehicle could simply scan the frequency X for signal, and assuming
each bicycle's transmitter would only go 100 feet or so (which would be
allowed by the FCC), the car could signal an alert whenever a signal is
found.<br>
</body>
</html>