Kenwood TH-D72A Service Manual page 38

TH-D72A/D72E
• From a cold start, it takes anywhere from 36 seconds to
5 minutes to display the latitude and longitude. From a
hot start, it takes anywhere from 1 second to 30 seconds
to determine the position. The time it takes to calculate
the position may differ depending on the GPS reception
state (reception signal strength, satellite quantity, etc.)
due to the infl uence of various primary factors (such as
satellite constellation, obstacles, weather, etc.).
When the reception state is not optimal, additional time
is required to calculate the position. Because the GPS
satellite is a surroundings satellite, the satellite place-
ment changes with the progress of time.
Reference: You can confi rm the GPS information (GPS
satellite arrangement, reception signal strength, etc.)
from the location data screen during positioning, by per-
forming the following operation:
Press the [ OK] key four times.
Latitude longitude display
Time altitude traveling direction speed
TP distance and traveling direction screen
Log meter display
GPS satellite information display
Fig. 6 Location data screen
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TROUBLE SHOOTING
[ OK]
[ OK]
[ OK]
[ OK]
• The GPS satellite signal used for the position calculation
is displayed in the bar painted out. The length of the bar
is the signal strength. The number under the bar is the
GPS satellite number.
• From a cold start, it takes anywhere from 36 seconds to
1 minute to calculate the position when the reception
environment is like the Open Sky environment, where
4 bars are at full length, in the bar display screen. When
the signal strength is strong with 4 bars at about half
length, and the position cannot be calculated from a cold
start, you may not be in an ideal environment. In this
case, relocate to an environment with better reception.
• In an Open Sky environment (where no obstacles are
present in a 360 degree circumference), it takes about
36 seconds to calculate the position from a cold start
(when more than 4 of the signals received from the GPS
satellite are "CN0=39dB-Hz").