Furuno GP32 Manuel D’Utilisation

7. OTHER FUNCTIONS 

The GPS SETUP menu smoothes position 
and course, averages speed, applies position 
offset, and deactivates unhealthy satellites. 
 
1.  Press the [MENU] key once or twice to 

open the menu. 

2.  Choose GPS SETUP and then press the 

[ENT] key. 

 

3.  Choose item and then press the [ENT] 

key. 

4.  Change setting with the cursor pad and 

then press the [ENT] key. 

5.  Press the [MENU] key twice to finish. 
 

When the DOP (Dilution of Precision, the 
index for position-fixing accuracy) or receiving 
condition is unfavorable, the GPS fix may 
change greatly, even if the vessel is dead in 
water. This change can be reduced by 
smoothing the raw GPS fixes. The setting 
range is from 0 (no smoothing) to 999 
seconds. The higher the setting the more 
smoothed the raw data, however too high a 
setting slows response time to change in 
latitude and longitude. This is especially 
noticeable at high ship’s speeds. “0” is the 
normal setting; increase the setting if the 
GPS fix changes greatly. 
 

During position fixing, ship’s velocity (speed 
and course) is directly measured by receiving 
GPS satellite signals. The raw velocity data 
may changes randomly depending on 
receiving conditions and other factors. You 
can reduce this random variation by 
increasing the smoothing. Like with latitude 
and longitude smoothing, the higher the 
speed and course smoothing the more 
smoothed the raw data. If the setting is too 
high, however, the response to speed and 
course change slows. The setting range is 
from 0 (no smoothing) to 9999 seconds. 
 
AVR. SPEED (Speed averaging) 

Calculation of ETA and TTG, etc. is based on 
average ship's speed over a given period. If 
the period is too long or too short, calculation 
error will result. Change this setting if 
calculation error occurs. The default setting is 
60 seconds. The setting range is from 0 (no 
averaging) to 9999 seconds. 
 
LAT/LON OFFSET (L/L position offset) 

You may apply an offset to latitude and 
longitude position generated by the GPS 
receiver, to increase position accuracy. 
 
DISABLE SV 

Every GPS satellite is broadcasting abnormal 
satellite number(s) in its Almanac, which 
contains general orbital data about all GPS 
satellites. Using this information, the GPS 
receiver automatically eliminates any 
malfunctioning satellite from the GPS satellite 
schedule. However, the Almanac sometimes 
may not contain this information. You can 
disable an inoperative satellite manually. 
Enter satellite number in two digits and then 
press the [ENT] key. To restore a satellite 
enter “00”.