Europe's airspace system has become more and more complex over the last years.  There are a lot of airspaces defined as combined Civilian and Military use, where Military users can claim such an airspace as short as 24hrs up front. Also increased geopolitical tensions forces authorities to anticipate on events quickly by setting up prohibited, restricted and no-fly zones at a pace not suitable using the standard AIRAC AIP delivery dates. 

Traditional paper maps cannot depict this day-to-day or even hour-to-hour dynamic Airspace Activations. For example an area in the Netherlands which has a number of defined military airspaces looks like this on the official paper map : 

When looking at this map its very difficult to tell where a GA pilot is allowed to fly, and the north-eastern part looks like an area to stay away from in all cases. In case of EasyVFR4 however, thanks to our meticulous maintained airspace database and direct NOTAM- and Airspace Use Plan Feed, EasyVFR4 is capable of depicting this same area showing which airspaces are actually active at a given timeframe  : 

 

 

How to set the Date&time timespan for which EasyVFR4 should show the Dynamic airspaces ? 

 

A route is loaded:

EasyVFR4 will automatically set the start of the timeframe to the date&time one hour earlier, rounded to the earliest whole hour as specified as take-off date&time for the route. The end of the timeframe will be set by adding 2 hours to the calculated expected time of arrival, rounded to the latest whole hour.

No route is loaded:

When no route is loaded the Date&Time span EasyVFR4 should use for showing Dynamic airspaces can be set using the map layers on-screen button :

 

and there choose the map interest time span option

Now the start  date & time and end date & time can be set 

How does Dynamic Airspace displaying work?  

EasyVFR4 uses a number of parameters to determine if an airspace is active or not :

  1. Time of Day limitations like daytime or nighttime as specified in the nation's AIP
  2. Day of week limitations like weekdays only or specific days of the week as specified in the nation's AIP
  3. Month of year (Seasonal) limitations as specified in the nation's AIP
  4. NOTAMs that activate/deactivate Airspaces 
  5. NOTAMs that create prohibited or Restricted areas
  6. NOTAMS about Relevant Activity Areas
  7. AUP (Airspace Use Plan)
  8. Supplements to the nation's AIP.

parameters 1,2 and 3 are self explaining, but lets explain a bit more about the others

 

NOTAMs that activate/deactivate Airspaces

For many Airspaces like TRA's, Restricted areas and Prohibited areas the national AIP gives that there will always be a NOTAM issued when they become active. For example the EH-TRA and EH-TSA  airspaces on the paper map snippet are all airspaces for which the AIP has defined that there will always be a NOTAM issued when they are activated. Because EasyVFR4 is connected to the official  NOTAM feed it is possible to do this NOTAM check. In this case no NOTAMs where found for these EH-TRA and EH-TSA airspaces, so they are not active for the setup Map Interest Timespan.  To depict this inactive state EasyVFR draws these airspaces using a fainted colouring : 

 

     Inactive vs. Active airspace 

Although not happening a lot, sometimes a NOTAM explicitly  de-activates an airspace. EasyVFR4 will depict these NOTAMS too by using a green NOTAM depiction for the Q-Line and of course displays the de-activated airspace as not active also  :

(Dynamic Airspace off / Dynamic Airspace on / NOTAM text)

As a pilot its often also very convenient to not only know an airspace is not active, but also to know if an often not active airspace suddenly becomes active. To facilitate this EasyVFR4 uses a pink interior filling of any airspace that is currently being activated by NOTAM:

(EHTRA84 Not Active / EHTRA84 Activated by NOTAM /  The activating NOTAM)

 

NOTAMs that create Prohibited or Restricted areas

Prohibited and Restricting areas are not always defined using pre-defined Airspaces listed in the Nation's AIP. Often a NOTAM describes an area, and EasyVFR4 will always plot such airspaces on the map using a red "NOTAM" bannered outline.

Graphical vs Textual depiction of a NOTAM created restricted Area

NOTAMS about Relevant Activity Areas

NOTAMs can also be issued to alert the Pilot about potential relevant activities , for example low level military flight training, Aerobatics, Glider flying etc. A pilot is allowed to fly in those areas but it is good to know these activities can take place. 

our NOTAM processing system analyses the NOTAM text and when it is 100% sure about the extracted area then EasyVFR 4 will mark this area using a pink "NOTAM"-bannered outline: 

 

When EasyVFR 4 is NOT 100% convinced about the extracted defined area it will draw the extracted area definition together with the Q-Line circle (a point+radius definition given by the NOTAM publisher as part of the NOTAM so is guaranteed to cover the involved area)

Although the drawn area is not always 100% correct, its good enough to understand where the activity is actually taken place. To declutter the map EasyVFR 4 has a special feature offering to suppress the drawing of the circular Q-line outline. When viewing the map using the NOTAM Map Preset a tap on the screen will bring up details about the NOTAMs that are valid for the tapped location : 

 

One NOTAM detail begins with "** NOTAM RE-PLOTTED BY POCKETFMS BASED ON EXTRACTED COORDINATES **; this is to differentiate this detail from the actual "official" version that is listed below that one. Note that both NOTAM Details refer to the same NOTAM id : ETCZ/M/1598/23, but the replotted one has a small "b" as suffix to the NOTAM number. The replotted area is good enough to define the area, so we can now remove the original Q-Line version from the map by tapping on the Hide or Delete button: 

Now a clear, comprehensive overview of all important NOTAMs  becomes available:

 

Airspace Use Plan (AUP/UUP) Activated Airspaces

Many European countries are using an Airspace Use Plan (AUP and UUP).  The AUP is published daily and it is valid for 24 hours, starting at 0600 UTC on the day of operation. Eurocontrol publishes Europe-wide EAUP.

Because EasyVFR4 knows which airspaces have their airspaces always activated by AUP, it uses this publication to either mark an airspace as not active or active, just as done with NOTAM airspaces. Instead of the pink colour used for NOTAM activated airspaces EasyVFR4 uses a purple colour to indicate AUP activated airspaces :

AIP Supplements

More and more countries are using AIP supplements to create temporary restricted areas for which there is no guarantee a NOTAM will actually be issued also. These AIP supplements are being issued more and more frequently, and require a continuous process to guarantee that these temporary areas are also shown on the map. EasyVFR4 is one of the few digital maps that offer these.

 

Dynamic Airspace Rendering Limitations 

Dynamic Airspace Rendering is only available for subscribers to our EasyVFR4 Live, EasyVFR4 Pro or EasyVFR4 FFM plans. 

Sometimes a NOTAM specifies more then just a simple start- and enddate/time, for example specific times for specific dates. In these cases EasyVFR4 will consider the airspace/notam active for the entire period the NOTAM is defined for, a kind of "better save then sorry" interpretation.