Jon Harder

I'm thinking about how to make this work on touch screens. Any ideas?

Is it still useful to have the alt/option-click method, or does this replace it completely?

Another iteration of the path feature was uploaded today:
• The "r" key clears all labels; tapping "r" any time has the same effect.
• No new labels appear as long as the "r" key is held down.
• Shorter hops are not displayed, to reduce clutter.
• The search for connected paths has been expanded.

APRS paths spanning from the Great Lakes to the Atlantic

Another followup to this — if you hold down the "r" (for recursive) key and select a footprint, it will expand to all the connected paths. To reduce clutter station callsigns are omitted.

You may need to refresh your browser to pick up the change.

The update has been uploaded. The map will self-correct over time or clicking on footprints with incorrect paths will load the corrected data. Thanks for helping to troubleshoot this.

The Es filtering needs more work. Right now it is triggered when there are at least three intersecting paths of 1750+ km from 6 distinct stations. Once that is met, any path of 500+ km in the vicinity is accepted. Something in there needs to be tightened up.

I think I found the problem. I'll do some testing and upload it soon if everything looks normal again. I thought I saw an optimization opportunity, but that just broke things in a mirror image way. I've documented that area better!

Hmm, I'm seeing that this morning too. It must have to do with with a recent update. I'll work on it. The update has to do with restoring e-skip detection and display. It is mostly working except for eliminating false positives. Something about that change must be causing what you see.

Do most people know the corn grown the corn belt is not edible directly? It mostly goes into ethanol, cattle feed, and such. The same for soybeans: biodiesel, oils, etc. The terms here in MN are "field corn" which is everywhere and "sweet corn" which is edible but I haven't any of that this season.

It seems OK to me. Could it be a local problem?

VHF propagation map showing activity from Wichita to northern Mississippi.

Happening now: I think this is legitimate propagation from Wichita to northern Mississippi. Can anyone on the ground confirm?

vhf.dxview.org
#hamradio

On small screens, the prediction will fill the view and on larger devices it will appear as an inset at the bottom left.

On large screen the prediction will change as the target destination is moved to a new location. The inset will move to get out of the way of the target as needed.

hf.dxview.org

A propagation prediction chart for 14 MHz between the grid squares PM35 and PI58.

There is a new button on all devices to reveals a propagation prediction between two points on the HF map.

To show the prediction, first select an initial location. Next select a distant point of interest. Finally, at the top of the window, select "show prediction …".

hf.dxview.org
#hamradio

A HF prediction for the 14 MHz band centered on Asia as captured by a phone screenshot.

Enhancements for mobile devices have been completed for the HF propagation map.

Most visitors to the HF map are using a phone or tablet. The experience on phones and tablets is much improved now.

The changes will be activated the next time you open or refresh the site.

hf.dxview.org
#hamradio

Notification - Web APIs | MDN The Notification interface of the Notifications API is used to configure and display desktop notifications to the user.

Notifications can be delivered via a browser

developer.mozilla.org/en-US/docs/W...

Toward the bottom of that page is a table of which browsers support the various features. I expect this will work better and better going forward.

Anyway, this is a starting point for adding notifications some day.

3.5 MHz propagation map showing a starred perspective location as seen on a phone screen.

The HF map is most useful when your location is selected because it personalized the map for your QTH.

18 MHz propagation map showing western Europe and featuring a draggable target and text input field for selecting a station location, as shown on a phone screen.

The draggable target for selecting your station's location has been slimmed down (same on mobile and desktops) and the corresponding text input moved to the top of the screen.

Panning or zooming the map under the selector now correctly updates the targeted location.

10 MHz propagation map showing western Europe on a phone screen.

ANNOUNCEMENT: the process of optimizing the HF+ propagation map for mobile devices has started. The app is working much better on small screens now. The band selection bar appears conveniently at the top of the screen.

hf.dxview.org
#hamradio

Good idea. What type of notification do you prefer? The Google Cloud doesn't allow email directly. Browser-based notifications might be possible but have no experience with that yet.

VHF propagation map of central Europe.

The VHF propagation map is working much better for mobile devices now. A significant number of visitors use mobile or tablet devices and this will greatly improve their experience.

Let me know if something should be working better!

vhf.dxview.org
#HamRadio

There's One Line I Don't Mind Waiting In. "THE GRAY-LINE or GREY-LINE"

The Latest Ham On A Bike Blogpost is out. There's One Line I Don't Mind Waiting In. "THE GRAY-LINE or GREY-LINE". #AmateurRadio #HamRadio #grayline #greyline #DX #HFpropagation #GraylinePropagation
Jon @ng0e.bsky.social you were referenced in this blog.
hamonabike.blogspot.com/2025/09/ther...

Touching a footprint highlights a station, which is the same as a mouse-over.

Touching an already highlighted station is the equivalent of clicking to get more details.

There are still some rough edges and improvements continue.

Screenshot from a phone showing VHF propagation centered on Germany.

ANNOUNCEMENT: the VHF propagation map is being optimized for tablets and mobile devices. It is working much better for the smaller screens.

There are a few differences between mouse- and touch-based interaction:

vhf.dxview.org
#hamradio

Users may want to tweak some settings in light of these changes:

In the Settings menu, try moving the opacity slider to down to the midrange to see the underlying map more clearly.

To see even more activity, try sliding the filter slider all the way to the denser side.

VHF propagation map of the NE USA.

The VHF propagation map will start showing more activity. A coding error when translating from Rails to Rust caused some activity to be filtered inappropriately.

vhf.dxview.org
#hamradio

Injuries and illnesses among school teachers Injuries and illnesses involving days away from work, job restriction, or transfer (DART) for school teachers occurred at an annualized incidence rate of 85.0 cases per 10,000 full-time workers in 202...

Violence and other injuries suffered by teachers: 20 / 10,000, twice the rate of other occupations. (2021 data, US Bureau of Labor Statistics, www.bls.gov/opub/ted/202...)

Now you may hold the alt or option key while selecting multiple stations to see their hops. They will linger for an extended time, allowing the callsign labels to disappear for a less cluttered view. (A browser reload may be needed to pick up this update).

I notice sometimes the footprint doesn't match the underlying hops. At the minimum the longest lobe should correspond closely to the longest hop. I've noticed some other anomalies where three directions are being displayed.

Thanks for taking the effort to reach out.

Five rescaled maps of Minnesota on a Mercator projection map, covering 1) a large part of northern Greenland, 2) a large part of northern Scandinavia, 3) a part of central Europe, 4) a region of southern India, 5) a region of southeastern Australia.

A website that lets you select a country or state and move it around a Mercator projection map to yield better size comparisons.

thetruesize.com, created by James Talmage and Damon Maneice

I always like hearing how the maps are used. Where I see clutter you find content! I'll look for a way to make that happen again.