Installation guide
12 |
NSS | Addendum for RTM-2, RTM-2.5 and RTM-3
EN
Wind barb symbols
The rotation of the wind barbs indicate the wind direction.
Wind speed is indicated by a combination of small and large barbs at the end of the wind tail.
Zero knots / Indeterminate wind direction
Small barb = 5 knots
Large barb = 10 knots
Arrow barb = 50 knots
If a combination of 5 and 10 knot barbs are shown on a tail then these will need to be added
together to give you the total wind speed. The example below shows 3 x large barb + 1 x
small barb = 35 knots, and 60 knots indicated with 1 x arrow barb + 1 x large barb.
Wind speed: 35 knots Wind speed: 60 knots
Animating GRIB weather forecast
The GRIB data contains forecast information for a set number of days. It is possible to animate
the weather data and to show the predicted forecast for a specific time and date. The time
scales vary depending on the file you are using.
Once animation is selected, the Clear time control panel button is displayed on top of the
chart panel. Time and speed dials will appear on the right hand side of the panel.
Speed dial
Time dial
• Press the rotary knob to change between the time and speed dials
• Press the Clear time control panel button or the X key to stop the animation
Selecting time
Turn the rotary knob to select the time for which you want to display the weather data. The
time increments may vary depending on the GRIB file.
The time shift is shown in the time dial and in brackets in the GRIB information window. The
time will be relative to the current time as provided by a GPS device connected to the NSS.
As a GRIB file ages it will be possible to see the historic data represented in minus hours until
the data becomes outdated. Once the data is outdated it reverts to the time frame being
relative to the earliest forecast in the file.
¼ Note: If no current time is provided via GPS the GRIB file time is only relative to the earliest
forecast in the file. It will then not show a real time weather representation.
Animation speed
Use the rotary knob to adjust animation speed.
Direction