November 13, 2012 APRS in Emergency Communications
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November 13, 2012
APRS in Emergency Communications
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Benefits of APRS:
1) Single-view, location-based data.2) Message broadcasting.3) Automatic logging of received messages.4) Integration with other services.5) Already built in to many mobileand handheld transceivers.
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APRS is generally used in two ways:
Broadcast
Peer to peer
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APRS Clients:Windows: UI-View (http://www.ui-view.org) (http://www.apritch.myby.co.uk/ uiv32.htm) APRS-ISCE (http://aprsisce.wikidot.com)Mac, Linux: XASTIR (http://xastir.org)iPhone (App Store): iBCNU PocketPacket
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Digipeter:
A station that retransmits receivedpackets after a brief time delay.
This can be done either by settings inthe TNC, or in the software.
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Linux and Mac can both useX-Windows based programs,like xastir.
http://www.xastir.org/wiki/Main_Page
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As root,chgrp users /dev/ttyS*Or,chmod 666 /dev/ttyS*
Depending on your system, thismay have to be done every reboot.
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Common SSIDs:0 – base1-4 – mobile/portable/tactical7 – HT or hiker10 – Internet gateways12 – One-way tracker13 – Weather station15 – General use
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Send a message to:CQ, TEST, or a specific callsignCQSRVR – An APRS-IS enabledgateway can digipeat messagesto a registered group of specificcallsigns.
Message text:CQ GROUPNAME Message
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Send a message to:CQSRVR
CQ ?: List all active groups on thisserver.
CQ ? GROUPNAME: Get a messageback with the member count.
CQ L: List all groups I am amember of.
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Send a message to:EMAIL: forwards a 67-char message (including address) tothe internet.
Message text:[email protected] Message
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Send a message to:WLNK-1: Use APRSLink via anenabled gateway.http://www.winlink.org/aprslink
Message Text:SP [email protected] SubjectKeep sending your message 1 lineat a time.End with /EX by itself.
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Send a message to:WLNK-1: Use APRSLink via anenabled gateway.
Message Text:SMS [email protected] Message
One line message
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Send a message to:WLNK-1: Use APRSLink via anenabled gateway.
Message Text:LGet a list of 5 messages pending.
R1Read message #1.
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APRS has even more potentialthan we’ve discussed tonight.
Bulletins relevant to large groupscan be broadcast at regularintervals.
Status reports from multiple sitescan be delivered at once and keptavailable for a period of time.