Frequently asked questions about DXMAPS.COM 3.0 propagation maps
You could also be interested in the user manual

Q) Maps are not shown / Maps are not updating automatically. What can I do?

A) First of all, make sure that Javascript is enabled for DXMAPS.COM in your browser.  Second, check the configuration of your Internet explorer and clear the cache (Internet temporary files). Sometimes can also help pressing the keys Ctrl+F5 (Shift+Command+R in MAC) to force a full reload.

Q) Why some callsigns are shown in different colours (blue, green, black....)?

A) The colour of the callsigns indicates the source of the information for a given report:

Additionally you will see some callsigns remarked on a yellow background (like XX0XX).  These are the DXMAPS supporter users. This is, users who are contributing to keep the server running.

Q) I'm not interested in WSPR, RB and APRS spots. How to do it to view only human made reports?
Q) I'm not interested in FM-SWL spots. How to do it to view only amateur radio reports?

A) Simply tick the "Only DX-Cluster" option.

Q) I am interested in digital modes, but I don't want to se the WSPR spots. How to do it?

A) Simply un-tick the "WSPR" option in the "Modes" options.

Q) Can I see a listing of the contacts, instead of a map?

A) Yes. Simply select the "List" tab at the top-left corner of the maps.  You can also select "Graph" to get a band-scope view.

Q) Why the DX-spots I sent from DXMAPS are not shown?

A) That could be done for a good number of reasons. First of all you have to understand that when you send a DX-Spot from DXMAPS pages, it is not directly incorporated to the database, but sent to the DX-Cluster network.  When that spot is received back from DX-Cluster, as all spots from other stations, is analyzed by a sophisticated routine that filters out spots that apparently are not real spots.  You would be amazed to know that more than 25% of spots flowing thought the DX-Cluster are not reporting a QSO, but are the result of misusing the network to cheer each other, ask questions, complain about something, etc.   There are also many spots which frequency is clearly wrong, or that the spotted grid square is outside the boundaries of the country of the reported station, etc.

Reports below a certain distance threshold are also discarded, as they are not considered DX.  The minimum distance depends on the band.

Some basic rules to make sure your spots are not filtered out:

  1. Don't write useless comments.  Texts like "Hello" or "Please" for instance will possibly lead your spot to be filtered out as it will not be considered the report of a QSO.
  2. Make sure that your grid square/locator is correct in the callbook
  3. Make sure that the reported data (callsign, frequency, grid square, etc.) are all correct.

Q) Is there an historical record of the maps and QSO?

A) Yes. You can query the database and and also look at former 2m animated sporadic-E maps.

Q) When I put a comment it shows both locators then my comment. How do I eliminate the locators from my comments?

A) Locators are the most important information you can add when sending a spot, as it shows the exact location of the stations, and allow DXMAPS to make the calculations. I don't understand any reason why you would like to eliminate the locators, but if that is really so important for you and you want to take the risk that your spot could be filtered out you can always send an unformatted spot.

Q) The service is free, but how is it funded?  Can I make a donation to contribute keeping the service up and being improved in the future?

A) Yes, the service is free and it will continue being free. However it requires hiring a powerful dedicated server and high speed Internet connection, with an approximate cost of US $250 per month.  This cost is covered thanks to the donations of supporter users and to the advertising.  If you like the service please consider some kind of donation.

Q)  What are the little red dots that I sometimes see on the lines?

A) They mark the estimated ground reflection points in multi-hop sporadic-E paths. They are only an estimate based on the geometry and as such should be interpreted.

Q)  What are the blue lines that appears across the world maps?

A) They are the geomagnetic equator and tropics. An interesting reference for north-south and TEP propagation. If you don't want to see it you can disable it in the Layer options.

Q) How can I post FM DX spots?

A) Please use FMLIST to report the received FM station on-line. As soon as you spot it there it will be also shown in DXMAPS maps.

Alternatively you can also use DXMAPS form to spot FM stations, but in that case you will have to indicate the Locator of the spotted station, so that the system can locate it.

Q) I can't send spots when my callsign contains a slash (/P, /M, etc). Why?

A) That is an old restriction of the DX-Cluster, not of DXMAPS.  When you send a spot using DXMAPS interface it is sent first to the DX-Cluster and then processed, if DX-Cluster does not accept it I can't do anything.

I can only suggest that you send the spots with a callsign not containing the slash character and previously update your grid square in the Callbook.

Q)  Can I post VOR spots?

A) Yes, simply use the format VOR/xxx (being xxx the callsign of the VOR).  If you don't know the Locator of the VOR leave that box blank and the system will try to take it from the VOR database. This is an example of how to spot VOR CDP (Capdepera) on 112.900 MHz.

Q)  I have an AIS receiving station. Can I post AIS spots?

A) Yes, simply download the AIS DX Aggregator program that will automatically upload AIS DX spots to DXMAPS.

Q)  I have an APRS station. Can I report the DX reception of APRS stations?

A) Yes, simply download the APRS DX Aggregator program that will automatically upload APRS DX spots to DXMAPS.

Q)  I use WSJT-X and JTDX for JT65 and JT9 modes. Can I automatically send DX-Spots to DXMAPS?

A) Yes, simply download the WSJT DX Aggregator program that will automatically upload DX spots to DXMAPS.

Q)  Sometimes the maps cover the last hour, but sometimes only the last minutes. Why does this happen? Can I configure it?

A) In order to keep the maps readable the number of QSO lines visible at a certain time on a certain map has to be restricted to 300.  Showing more QSO lines would end up in an unreadable and useless map.  If the number of visible contacts/reports is 300 or less then the map will cover the last hour. Otherwise the time span shown will correspond with the most recent 300 contacts/reports.

Take into account that, specially in the most popular HF bands, it is not unusual to have more than 100 QSO reported per minute, specially through the Reverse Beacon network, so it could happen that if you don't apply some kind of filtering you only see the contacts/reports of the last 2 or 3 minutes.  In those cases you should consider filtering by "DX-Cluster only", or by some mode, or restrict the map to a regional area.

Q)  When a click on the tab of a regional map (Europe, North America, etc) it does not show that region. Why?
Q)  When a click on the tab of a regional map (Europe, North America, etc) it does not show the same area that in older versions. Why?

A) When you first select a regional map it will show the default area coverage and zoom level for that area, but if you drag or zoom the map (even outside the original region) those settings will be preserved and the next time you click on that regional map tab you will see the latest coverage and zoom level you had selected.  This is done on purpose so that every user can choose the exact boundaries and zoom level he wants for a each region.

You can right click on the map a select the "Restore default map/zoom" option to restore that map to its original view.

Q)  When a select some of the show/hide options in the right-click menu, the option is not preserved and when I change of map I have to select it again. Is this a bug?

A) The show/hide options in the menu that appear when you right-click on the map are only for temporarily use.  You have to select it in the corresponding option lists on top of the maps so that it is preserved.

Q)  Options are lost.  When I access the site I have to configure the options I like every time.  Why does this happen?

A) Please notice that if you are normally accessing DXMAPS using a favourite/maker/bookmark in your Internet Browser you MUST updated it.

Some of the parameters passed in the URL for accessing version 2.8 will force the default values of the configuration options of version 3.0.  This happens because version 3.0 has much more configuration options.

In version 3.0 click the "heart" icon at the right of the title to create the correct link to the corresponding new page,  Then update you bookmarks or create new ones.

If you access DXMAPS using the new URL format and your internet browser preserves cookies between navigation sessions then ALL configured option will be kept.

It is IMPORTANT to take into account that simply navigating always to (without any parameter after that) you will get exactly to the map/band/options you had in the previous navigation session, so saving a long URL with all those parameters it is no longer required for 99% of us, and in fact it can be counterproductive.

Q)  Can DXMAPS be used with a tablet / mobile phone?

A) Yes, it has been proved to work with Apple, Android and Microsoft devices.  The only requirement is that you use a modern version of the internet browser, that the processor of your device is decently fast and that the network speed is acceptable (not GPRS or so).

I you are using an Apple (IOS) device read the next questions and answers.

Of course, no need to say it, for a better experience the device has to be in panoramic (horizontal) view.

Q)  On my iPad and iPhone, using Safari, often appears the message "There was a problem with this webpage so it was reloaded" and it tries to reload the page once and once again.  Why does this happen?

A) Believe it or not this is not due to DXMAPS code and that message appears also when visiting many other sites.  It is a bug in the code of iOS related to memory handling starting from version 8.0, that Apple has not fixed yet (!!!).  If you don't believe me just Google the text "There was a problem with this webpage so it was reloaded" and you will see.

A way to minimize/eliminate the problem is to select the "Small map" option in DXMAPS options.

Q)  On my iPad and iPhone, using Chrome, often appears the message "Oh, no!  Error showing this web page".  Why does this happen?

A) Read the same above answer and workaround for Safari.

Q)  How can I simulate the mouse right-click in my tablet / mobile phone to get access to the contextual menu?

A) In the same way that for almost any other application running on this kind of devices.  Hold your finger on the map for about one or two seconds. When you release your finger the contextual menu will appear.

Q)  Is there some tutorial on how to use DXMAPS?

A) You can read the user manual.



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