Little Navmap can display weather as METARs and decoded weather in the information window and tooltips as well as weather symbols on the map.
Weather can be taken from the following sources:
- FSX or P3D if connected. This also applies to network setups.
- X-Plane real time weather from the
METAR.rwxfile. Not available when Little Navmap runs on a different computer than your flight simulator.
- NOAA online weather service
- VATSIM network online weather service
- IVAO network online weather service
- HiFi Simulation Technologies:
- Active Sky Next (ASN)
- Active Sky for Prepar3D v4 (ASP4)
- ASX for X-Plane
Weather display and information can be selected in the following locations:
- Options dialog on page Weather: There you define what source is shown in the information window and in the map tooltip. This is based on the airport METAR reports and does not affect anything else besides information and tooltip.
- Main menu
Weather-> Airport Weather Source: This is for the airport weather icons on the map. Based on METAR of the airport and does not affect anything else except the weather symbols on the map.
- Main menu
Weather-> Wind source: This source is used for all winds aloft functions: Map display wind grid symbols, map tooltip, flight plan table, elevation profile (hover tooltip), TOD and TOC calculation, fuel planning, ETA calculation and trip time calculation. Not that this download has nothing to do with the METAR functions above and is fetched from another source (NOAA/NOMAD).
You have to set the base path for X-Plane in the
Load Scenery Library dialog to enable reading of the weather file.
Certain features like regions of manually created weather files are not
METARs are shown in the airport tooltips and on the
tab. Decoded weather information for all sources is available in the tab
The date and time information of the decoded weather display is highlighted in red if the METAR information is older than six hours.
About X-Plane weather: Little Navmap can only read the
METAR.rwx file which contains downloaded online weather. The
program cannot read custom weather situations from X-Plane. If you use
custom weather, Little Navmap only has access to the local weather
around the aircraft. Be aware that Little Navmap might display
information from an obsolete or inactive downloaded weather file.
Also, weather and nearest weather in X-Plane might be inaccurate. This is due to interpolation between weather stations. Another problem is X-Plane falling back to default weather if a METAR cannot be decoded although it is reported correctly in Little Navmap.
48.1. Weather Sources¶
48.1.1. Flight Simulator¶
Weather information from a flight simulator or the X-Plane
falls in one of three categories, depending on the selected airport:
Station: The airport has a weather station. This is the most precise weather indication.
Nearest: The selected airport has no weather station and the report from the closest existing weather station was fetched. The ident of the closest station as well as distance and elevation are shown in the METAR and on the decoded weather tab. Note that the this weather station is not necessarily an airport.
Interpolated(not for X-Plane): The weather is interpolated by the flight simulator using three stations closest to the selected airport. FSX and P3D only provide non-interpolated weather for airports close to the user aircraft. The weather for other airports is always interpolated. The ident of the selected airport is used in the METAR report for this kind of weather report.
The flight simulator weather is updated every 15 seconds to catch manual changes or changes in the weather theme.
Little Navmap watches the X-Plane
METAR.rwx file for changes and
will apply updates immediately.
48.1.2. Online - NOAA, VATSIM and IVAO¶
Online weather from both sources is updated every 10 minutes.
48.1.3. Active Sky¶
All Active Sky programs are recognized automatically on startup for
each simulator. The
activeflightplanwx.txt files are loaded and monitored for changes.
Weather will be reloaded and updated in the information display if
You can also select the
current_wx_snapshot.txt file manually. In
that case the METARs from this file are displayed for all installed
flight simulators. The
activeflightplanwx.txt will be loaded from
the same directory.
Manual file selection can also be useful if a new Active Sky version is not supported by Little Navmap yet.
Departure and destination weather will be displayed if a flight plan is
loaded in one of the Active Sky programs. A suffix
Departure will indicate the usage of Active Sky flight plan weather
on the tab
Weather. This gives Active Sky users the most precise
weather indication for departure and destination.
Note that the indication of
entirely on the flight plan loaded in Active Sky and not the flight
plan in Little Navmap.
48.2. Airport Weather¶
Little Navmap can show weather symbols for airports having a weather station for all available weather sources. Select sources for display with Airport Weather Source.
Note that airport weather is only displayed for stations and not interpolated. Stations which are not airports are not supported.
- Map is added to the flight rules in the METAR and decoded
weather display of the information window and tooltips to indicate which
source is shown on the map.
See Airport Weather for an explanation of the symbols.
48.3. Winds Aloft¶
Little Navmap can download and display winds aloft based on either X-Plane or the National Oceanic and Atmospheric Administration data.
The latter ones are winds aloft forecasts which are updated four times a day and are used by most simulators and weather programs as data source. The wind speed and direction is arranged in an one-degree grid.
Little Navmap can display a wind barb grid for a selected wind layer or at flight plan waypoints. Tooltips at the wind barbs show wind details for several layers at the position.
Hovering the mouse over the elevation profile shows the wind at the flight plan position. See Tooltip Label.
Winds are used to calculate flight time, trip fuel, top of descent and top of climb.
A manual wind setting for cruise altitude can also be used. See Buttons.
Select wind data source for display with Wind source.
The wind barbs show an optional tooltip with wind direction, speed and wind source if you hover the mouse over them.
Direction is magnetic per default but can be changed in the options dialog on page Units. These tooltips show the wind for all layers where the currently shown layer is highlighted bold. The cruise altitude is added as an extra layer if selected for display.