Furuno GP-170 - GNSS Menu; How to Select the Positioning System; How to Set the Time for Smoothing of Position, Speed and Speed Average

9. OTHER FUNCTIONS
9-4
9.3 GNSS Menu
9.3.1 How to select the positioning system
1. Press the MENU/ESC key to open the main menu.
2. Select [8 System Setting] then [5 GNSS].
3. Select [1 Method].
4. Select [1 GPS].
5. Press the MENU/ESC key to close the main
menu.
9.3.2 How to set the time for smoothing of position, speed and
speed average
Position smoothing: When the receiving condition is unfavorable, the GPS fix may
change randomly, even if the ship is dead in water. This change can be reduced by
smoothing the raw GPS fixes. 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. Increase the setting if the GPS fix
changes randomly.
Speed smoothing: During position fixing, ship’s velocity (speed and course) is direct-
ly measured by receiving GPS satellite signals. The raw velocity data may change ran-
domly 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.
Speed average: This speed is used to calculate the COG and SOG on the data dis-
play (see page 7-6).
1. Press the MENU/ESC key to open the main menu.
2. Select [8 System Setting] then [5 GNSS].
No. 2, 3 and 4
are reserved
for future use.