Furuno GP-33 User Manual page 53

7. OTHER FUNCTIONS
Smooth Position
When the receiving condition is unfavorable, the GPS fix may change randomly, even
if the boat 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 set-
ting 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 boat speeds.
"0" is the normal setting; increase the setting if the GPS fix changes randomly.
Smooth S/C (speed/course)
During position fixing, your boat's velocity (speed and course) is directly measured by
receiving GPS satellite signals. The raw velocity data may change randomly depend-
ing 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.
Lat Offset, Lon Offset
If there is the error between the positions shown on your equipment and chart when
docking at a pier, you may apply an offset to latitude and longitude position. Mark own
boat's position on the chart to calculate the error with latitude and longitude, and enter
the values.
Disable SV (satellite)
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 sat-
ellite schedule. However, the Almanac sometimes may not contain this information.
You can disable an inoperative satellite manually. Enter satellite numbers (max. three
satellites) in two digits.
SV ELV (satellite elevation)
Set the minimum elevation of satellites to use to fix position.
7-3