© Flytec USA, 2003
16
A12 Real-Time Map Page
A brief press of the ESC will bring up the real-time map page where your track, waypoints, the active route, and
entered restricted airspace will be visible. If the
Competition Route
is active, turnpoint cylinder will be shown as well.
Digital vario, altitude and airspeed will also be shown just below the map. Due to the new real-time operating system
the vario audio will continue to work when viewing the real-time map page. Your current position will be shown on the
track with a direction arrow. The track is drawn backwards from the current position towards the beginning of the
flight. This way you will not have to wait for the entire track to be drawn to see your current section of the track. The
view may be zoomed in and out with the F1 and F2 keys. When the pan and zoom functions are used it will take a
few moments to redraw the map/track (
Wait
and
Ready
will corresponding appear on the
Status Line
). If a zoom key
is pressed while a map is being redrawn the original redraw will be suspended and will start over again with new
pan/zoom selection. This will allow you to quickly view the desired section of the map.
B GPS Functions
Currently there are more than thirty satellites in Earth’s orbit. It is possible to determine your position very precisely
anywhere in the world by receiving signals from these satellites. Therefore, the use of GPS receivers has become
indispensable for navigation and competition.
B1 Assessment of Reception Quality
The 5030’s GPS receiver can be turned on and off by holding down the
F1/GPS
key for three seconds. With the
GPS enabled, the 5030 can follow up to sixteen satellites at the same time. After turning on the 5030, it is necessary
to receive at least four satellites to fix position for the first time. Once the current position is acquired, three satellites
(for 2D positioning) are sufficient for further navigation. However, if you want to record GPS altitude in a flight record,
then four satellites are required.
There is a
Satellite
Almanac
table in the GPS receiver that keeps track of the path, place, and time of all satellites
with reference to the receiver. The Almanac is continuously updated during signal reception. However, if the signal
to the Almanac memory is disrupted completely or the 5030 is taken 125 miles or more from the last reception point,
then the Almanac has to be re-established. In this case it can take ten minutes (or more) to determine the new
position. When the 5030 is turned off power is still supplied to the almanac’s memory
When the 5030 has been moved a great distance without GPS reception, you can help facilitate initialization by
entering the approximate new position (whole number coordinates suffice) in the
Set Up menu
under Menu>Basic
Settings>Init GPS. With the antenna unobstructed, the unit will normally recognize its position after a few minutes.
The geodetic ID (i.e., WGS84) can also be set under Menu>Basic Settings>Init GPS
If the receiver is turned off for only a short period of time (less than 2 hours), it should take less than a minute to
determine the location. Buildings, mountains or thick forest affect reception quality. Therefore, you should always
look for the best possible visibility to the sky. The antenna, under the 5030 label, should point upwards. When the
unit is fastened to your control frame, it should not have more than 45° deviation from a horizontal position. Because
the received strength of the satellite signal is only 1/1000 that of mobile radios, these radio receivers and other
disruptive factors (like notebook computers) should be kept as far away as possible from the 5030.
Together with the navigation signal, information about the location precision (DOP i.e., dilution of precision) is
received. The value for the reception quality, shown on the display, is derived from this signal. If at least
50%
of the
symbols are filled in the GPS status area, then the error in position is less than 30 feet. The longer the filled in
section is, the more precise is the reception. In addition, the number of satellites that are currently being used is
shown at the end of this bar.
B2 Compass and Flight Direction
In contrast to a normal magnetic compass that is oriented to magnetic north, the GPS compass can show direction
only when the user moves about. However, it has the advantage that it is not subject to any grid deviation and does
not show any deviation as a result of ferrous or magnetic material. Its zero point always corresponds with true
geographic north
(0 or
360 degrees).
6
Bat.
3.57V
12h
