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Method of Positioning by GPS
Displaying Position Information of Remote Stations in Digital Mode
With V/D mode of the C4FM digital, the GPS position information is transmitted
simultaneously with voice signals; therefore the direction and position of the remote
station can be displayed in real-time even while communicating.
For details, see “Real-Time Navigation Function” on page 93.
Tip
Even if the GPS function of your station is set to OFF, the position information of the remote station
can be displayed in V/D mode.
Caution
When the GPS function is not active, the remote station cannot display the position information for
your station.
About Positioning by GPS
“Positioning” refers to calculation of your current position from the satellite orbit
information and radio propagation time. At least 3 satellites need to be acquired
for successful positioning. If positioning fails, move away from buildings as far as
possible and stand in an area with open sky.
The measurement environment may result in positioning errors of several hundred
meters. Under favorable conditions, positioning can be performed successfully using
only three satellites. However, under the following poor conditions, the positioning
accuracy can decrease or positioning can fail.
• Between tall buildings
• Narrow paths between buildings
• Indoors or in close proximity to large buildings
• Under elevated roads or high voltage power lines
• Between trees such as in forests or woods
• Inside a tunnel or underground
• Through heat reflective glass
• Areas with strong magnetic fields
When using the GPS functions for the first time after purchase, or when it has been
unused in a while, a few minutes may be required to acquire the satellites. Also,
if the GPS function has been turned off for several hours, a few minutes may be
required to search for satellites.
