Automatic Packet Reporting System APRS is an amateur radio -based system for real time digital communications of information of immediate value in the local area. APRS data can be displayed on a map, which can show stations, objects, tracks of moving objects, weather stations, search and rescue data, and direction finding data.
APRS data is typically transmitted on a single shared frequency depending on country to be repeated locally by area relay stations digipeaters for widespread local consumption. The initialism "APRS" was derived from his call sign. This early version was used to map high frequency Navy position reports.
As GPS technology became more widely available, "Position" was replaced with "Packet" to better describe the more generic capabilities of the system and to emphasize its uses beyond mere position reporting.
APRS Automatic Packet Reporting Systemis a digital communications protocol for exchanging information among a large number of stations covering a large local area, often referred to as " IP -ers".
As a multi-user data network, it is quite different from conventional packet radio. Rather than using connected data streams where stations connect to each other and packets are acknowledged and retransmitted if lost, APRS operates entirely in an unconnected broadcast fashion, using unnumbered AX.
APRS packets are transmitted for all other stations to hear and use. Packet repeaterscalled digipeaters, form the backbone of the APRS system, and use store and forward technology to retransmit packets. All stations operate on the same radio channel, and packets move through the network from digipeater to digipeater, propagating outward from their point of origin.
All stations within radio range of each digipeater receive the packet. At each digipeater, the packet path is changed. Digipeaters keep track of the packets they forward for a period of time, thus preventing duplicate packets from being retransmitted. This keeps packets from circulating in endless loops inside the ad-hoc network. While it would seem that using unconnected and unnumbered packets without acknowledgment and retransmission on a shared and sometimes congested channel would result in poor reliability due to a packet being lost, this is not the case, because the packets are transmitted broadcast to everyone and multiplied many times over by each digipeater.
This means that all digipeaters and stations in range get a copy, and then proceed to broadcast it to all other digipeaters and stations within their range.
The end result is that packets are multiplied more than they are lost. Therefore, packets can sometimes be heard some distance from the originating station. Packets can be digitally repeated tens of kilometers or even hundreds of kilometers, depending on the height and range of the digipeaters in the area. When a packet is transmitted, it is duplicated many times as it radiates out, taking all available paths simultaneously, until the number of "hops" allowed by the path setting is consumed.
Positions of fixed stations are configured in the APRS software. Moving stations portable or mobile automatically derive their position information from a GPS receiver connected to the APRS equipment. The map display uses these fields to plot communication range of all participants and facilitate the ability to contact users during both routine and emergency situations.
Each symbol on an APRS map can display many attributes, discriminated either by colour or other technique. These attributes are:.Vampirism skyrim pros and cons
The Status packet is free-field format that lets each station announce its current mission or application or contact information or any other information or data of immediate use to surrounding activities. The message packet can be used for point-to-point messages, bulletins, announcements or even email.
Bulletins and Announcements are treated specially and displayed on a single "community Bulletin board". This community bulletin board is fixed size and all bulletins from all posters are sorted onto this display. The intent of this display is to be consistent and identical for all viewers so that all participants are seeing the same information at the same time.
Since lines are sorted onto the display, then individual posters can edit, update, or delete individual lines of their bulletins at any time to keep the bulletin board up-to-date to all viewers.Instalar piso laminado click
All APRS messages are delivered live in real-time to online recipients. Messages are not stored and forwarded, but retried until timed out. The delivery of these messages is global, since the APRS-IS distributes all packets to all other IGates in the world and those that are messages will actually go back to RF via any IGate that is near the intended recipient. In its simplest implementation, APRS is used to transmit real-time data, information and reports of the exact location of a person or object via a data signal sent over amateur radio frequencies.The following APRS symbols is currently supported.
Please note that the description of each symbol is based on a combination of the version 1. In this list we include all primary symbols, all default alternate symbols, all overlayed alternate symbols that has a specified description and all overlayed alternate symbols that is used by some station. In this tab we show all APRS packets of any packet type that has been added to the map.
In this tab we show APRS packets of type position that has been added to the map note that any station may send a position packet.
In this tab we show all APRS packets of type object or item that has been added to the map. In this tab we show APRS packets of type weather that has been added to the map note that any station may send a weather packet, not only weather stations. In this tab we show APRS packets of type direction finding, telemetry, message, query and status that has been added to the map.
Select date and time to show map data for enter time for your locale time zone. The regular time length select box can still be used to select how old data that should be shown relative to selected date and time. Support me. Code and Table:! Date and time: Select date Select time reset. Current time is: reset. Station filter.First, by default SSID if no other vehicle data is available. See the table below. If your net must have different defaults, contact me. Once the BText has been received by a station, the mobile will then be displayed using the specified symbol.
The advantage of this method is that more symbols are available than from the SSID convention. Enter the type of area, and color. The line is an exception. It is still top to bottom, but the lower point can be to the left of the beginning point. Be cautious in using the color fill option, since all other objects in that area that occur earlier in your PLIST will be obscured.
Additionally a radius of Huricane and also Tropical storm winds will also be shown if the format detailed in WX. HTM is used. APRS can also be permanently embedded in maps. To embed a symbol in a map, simply make the first four characters of the label be a followed by the dual symbol character, followed by a hex number from 1 to F that indicates the color for the symbol.
The remaining 8 characters can be used for a conventional label at the same location. In keeping with the idea of using the primary table where possible for active stations and the alternate table for OBJECTS, I also moved the following to the alternate table again recognizng both until the primary is re-used:! The permitted labels are ,!The "U.Tuscaloosa city school district tuscaloosa al 35401
Note that for web display purposes, the images are presented in GIF format. Rather a two-character alpha-numeric code is transmitted that causes an image already stored at the receiving station's end to be displayed.
Everyone in the network must update the images already stored in their APRS software. Zip files containing this revised character set in formats ready for use with. WinAPRS cannot be updated since the symbol set in this program is embedded inside the main compiled. EXE file, rather that as readily replaceable external image files. I have attempted several times to reach the authors of this apparently abandoned program to offer them these revised symbols with no success.
Click Here to download a text file summarizing the symbol assignments by letter. A standard APRS-format position report looks like:! The character after the latitude emphasized in red above determines if the symbol to be displayed is from the primary set or secondary set below. The character after the longitude emphasized in green above determines which symbol out of the selected set will be displayed.
Choosing a character from the table above causes the symbol in the corresponding position from one of the tables below to be displayed. The cross-hair symbols occupy symbol slots that have not yet been assigned. The overlay character can be a single digit 0 through 9 or letter A through Z. In such programs, you will see the base symbol from the secondary set, but not the overlaid character or digit.
This will be most obvious with new generation digipeaters that use the solid green star in the secondary set overlaid with a letter to indicate capability, instead of the traditional star with fixed "D" from the primary set. This zip file contains the revised symbol set for the main UI-View program. Especially in crowded urban areas, symbols overlap less and maps look better with the smaller icons.
Just unpack the zip file into the main UI-View directory. Therefore, updating UI-Point requires overwriting the original files with like-named files. The same issue applies to overlaid WX stations blue circleoverlaid numbered cars, numbered boats, etc. The zip file below contains the same updated symbol set in a format compatible with APRSplus and will overwrite the original symbols.
As a result, many of the symbols available for selection were ad-hoc improvisations of the program author and would only appear the same way on another copy of APRSplus. Some of the symbols such as the red,white and blue USA outline, sputtering bomb and various others will no longer show.
Further, some of the text captions in the icon-selecting dialog will be incorrect. The correct code for the selected symbols will be transmitted, only the local text description of the icon will be wrong. The text labels for the symbols come from a table embedded in the main program executable file.
This table could be altered with a binary or hex editor if desired. Overlaid Symbols Some of the secondary table symbols can have an alphanumeric overlay.And here, on the left side of the mast, are the completed antennas. On the top right side of the mast is a fancy new wind turbine, which is generating 48V DC to help power the commercial network equipment on the site.
Green energy, global warming, you know the story. It was installed this summer, and it's already broken - the bearings are making so much noise that the neighbors are more than slightly annoyed. Wednesday, December 30, aprs. To facilitate peer support and discussion about aprs. A bit like Yahoo groups, you can send and receive group mails using email just like a regular mailing listor you can use the web interface, or read the posts using an RSS reader.
If you've got questions on how to use aprs. I'd also like to encourage experienced users to answer any questions posted by others, if you happen to know the answer. I'd greatly appreciate your support - any time I don't need to spend writing emails I can use for developing new features.
Links to this post. I've connected aprs.
If you don't wish to see them on the map, you can always hide the WX stations in the Preferences. Several users have also requested that support for the Google Maps Traffic would be added. It's there now, along with a couple of other popular overlays behind the More button.2020 SDR Guide Ep 2 : How to use over 500 remote SDRs free online (webSDR, KiwiSDR \u0026 HFDL decode)
The traffic data is collected using crowdsourcing methods Google's viewso it's available on those roads where people use Google Maps to navigate excluding iPhone users.
The heard and gated maps have also been fixed a bit, they no longer load all the other stations in the view. That was a stupid bug on my part. These views have also received some technical improvements and speedups. As a side-effect I erased the hour history tables, so those views and the "heard by" tables in the info pages will be a bit empty for the next day or two.
Sorry about that. The info pages now show symbols together with the callsigns in the tables. Hmm, sorting by symbol doesn't seem to work, though. There's also a new service status view. Labels: features. Saturday, December 26, Sortable tables and log Y scale. The tables shown on the info page are now sortable - click on the column header to sort, and click on it again to sort in descending order. The "nearby stations" table doesn't sort nicely, though, since it's actually two tables embedded in a single table, and it's sorted as if it was a single table of content.
I'll have to figure out something for it. Merry Christmas! The graphs page of APRS igates and digipeaters now shows a new graph which tries to describe how well the station's receiver is performing by plotting the number of position packets received from a given distance during a month.
There will be multiple lines, one per month, over the past few months. A receiver in the middle of a big city might hear well from a long distance, but there is simply so much traffic close to the receiver that the linear Y scale of the graph hides the position packets from the distant stations. Maybe I should switch to a logarithmic scale, or would that be too confusing?
Stations transmitting invalid or fake coordinates will skew the stats. If the transmitting station claims to be km away due to a bad GPS fixmy best guess can only be that the station actually is that far away.
Items and objects are not shown here, since they are usually far away from the transmitter which transmitted the packets. AIS support is still in the works, I need to add a method to configure the coordinates of the receiver.
The aprs.Why Illustrator? Try Inkscape. It is very capable vector graphic editor, free and open source. I tried Inkscape before starting this effort a couple years back, and I think Illustrator is better. I also needed the other apps photoshop, lightroom, after effects, premiere in the Adobe suite for other things, and they integrate well. I am a long-time open source user and advocate, so I did not make this choice without consideration.
Hi Hessu, thanks for all your efforts and the upgrade today. Thanks for advising what to do or expect. Oops, embedded map loading was broken after the upgrade.Enhancer meaning in telugu
It's fixed now. Thanks for the report. When I put the store shopping cart in there, I don't think the hamfest was documented. Excellent news! I am very much looking forward to the release of those symbols on Github, many thanks for leading the way here. Post a Comment. Tuesday, November 3, New symbol graphics and better support for mobile devices. Old symbols, scaled up, pixels obvious [updated the set is now available on github.
The new symbols are drawn in vector format as opposed to a raster format at a fixed resolutionallowing them to be rendered at larger and smaller sizes without distortion or blurriness.
The new symbols are slightly larger than the old ones, making them easier to recognise on modern displays having smaller pixels than the old ones. New symbols, scaled up - no pixelation! One downside is that they are just a little bit bigger than the old ones, taking up more space on the screen.
On the other hand, the old ones were a bit too small on modern displays, and the very small resolution did make it hard to understand what the symbol tried to mimic. The new aprs. Other APRS applications may then use them, too, at no cost. Raster renderings are available in 24x24, 48x48, 64x64 and x pixel resolutions - drawing from raster sprites in apps is usually quicker and easier than working with the vector source material.
Having the vector sources makes it possible to improve them and and replace individual symbols easily.Load average linux 1 5 15
Naturally I did not draw all of the symbols myself. Many are loosely or strongly based on the original symbol graphics, primarily to keep the familiar and consistent look.
Some symbols I obtained from other sources, such as Wikipedia.
In those cases I picked SVG versions which allow commercial reuse source known, and the work is placed on public domain, or with a CC license which allows adaptation and commercial reuse.The real-time map which opens up first when you arrive on the site displays, in nearly real time, APRS and AIS data on top of maps or satellite images provided by Google Maps.
By default, it opens up showing the real-time situation in an area which should be relatively near your current location. The location guess is based on your IP address and it is a bit rough, but usually it opens up at least in the correct country. It is possible to select and save an initial view, but more on that later. On the left side of the map you'll find the familiar Google Maps map controls which can be used to zoom and pan around the map.
You can also use the mouse to drag the map, and the wheel of a mouse if you have one to zoom. On the right side of the map is a menu area containing the search boxes, links to switch views, links to information pages, and possibly some advertisements or links to news about the aprs.
Near the bottom, right above the advertisement is a small status box which indicates the rather frequent updates of the real-time map data. The updates normally happen once every few seconds. Clicking on any of the ship or vehicle symbols will open up an info balloon showing current information on that tracking target.
Near the top right corner there is a drop-down selection for the amount of history shown. When looking at the real-time view of an area and not tracking a stationthe maximum setting is 24 hours. Beware — if you're looking at a busy area, or have zoomed out to see a lot of APRS stations, selecting 24 hours will likely make your browser slow down to a halt, just because it needs to display so many symbol graphics and path lines.
If you're having trouble with the map being too slow, or the browser freezing, please take a look at the troubleshooting section. The first input field in the top right corner of the page, labelled Track callsign is used for looking up a specific station by it's amateur radio callsign.
Ships can be looked up by either their names which are not always unique or by their unique MMSI numbers think of it as a phone number for the ship. Enter the callsign of the station in the box and click on Search. The most recent known position of that transmitter will be shown. For example:. Please right-click the link and select Open in new window or new tab to avoid navigating away from this page.