Furuno 1823C Manuel D’Utilisation

Local Time Offset    Allows the user to use local time (instead 

of UTC time). Enter time difference 

between local time and UTC time. Use 

the + < - - > - soft key to switch from plus 

to minus and vice versa. 

-13:30 to +13:30 hr  0 hr (no offset) 

Geodetic Datum 

Your equipment is preprogrammed with 

most of the major chart systems of the 

world. Although the WGS-84 system, the 

GPS standard, is now widely used other 

categories of charts still exist. Select the 

chart system used, not the area where 

your boat is sailing. 

Use the trackball or 

[ENTER] knob to 

select appropriate 

chart. 

WGS-84 

Position Smoothing  When the DOP or receiving condition is 

unfavorable, the GPS fix may change, 

even if the vessel is dead in water. This 

change can be reduced by smoothing the 

raw GPS fixes. A setting between 000 to 

999 is available. The higher setting the 

more smoothed the raw data, however 

too high a setting shows response time to 

change in latitude and longitude. This is 

especially noticeable at high ship’ 

speeds. Increase the setting if the GPS 

fix changes. 

0-999 sec 

0 sec (no position 

smoothing) 

Spd/Cse 

Smoothing 

During position fixing, ship’s velocity 

(speed and course) is directly measured 

by receiving GPS satellite signals. The 

raw velocity data may change 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. For no 

smoothing, enter all zeros. 

0-999 sec 

5 sec 

GPS Speed 

Average 

Calculation of ETA 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, which is suitable 

for most conditions. 

0-999 sec 

60 sec 

Latitude Offset 

Offsets latitude position to further refine 

position accuracy. Use the N <- - > S soft 

key to switch coordinate. 

9.999’S – 9.999’N 

0.0’ (no offset)