Furuno CI-80 - Manual (Page 22)

18
MARK Menu
This menu sets measuring conditions for tide vector and target
point mark.
PRESET REFERENCE VALUE: Sets the effect of tide on the
target point mark. The higher the figure, the greater the effect
of tide.
TIDE HISTORY: Sets tide vector plotting interval, among 0
(turns off tide vector display), 15 sec. (1/4 min.), 1 min., 5 min.,
10 min., 30 min., and 60 min.
AVR Menu
The AVR (Averaging) sets averaging time for measuring raw
speed, tide and water tracking data, to smooth out random
variation of data.
SHIP SPD AVR: Raw speed data (from connected sensor) may
change randomly due to receiving conditions, etc. If speed data
varies greatly increase speed averaging. Speed averaging is
available in times of 15 sec., 30 sec., 60 sec., and 90 sec. The
default setting is 15 sec., which is suitable for most conditions.
TIDE AVERAGE: Direction and speed of a tide changes with
time, place and depth. Therefore it is important that the current
indicator not respond to quickly or too slowly to tide movement.
Tide averaging time is available between 0 and 5 minutes in
the nearest minute. (“0” is for use of raw tide data.) In most
cases “2 min.” provides excellent results. Too high a setting
may prevent detection of rapid changes in tide movement, such
as a current rip.
WT SPD DEPTH: Sets measuring depth of water speed in the
water tracking mode. The default setting is two meters, and it is
suitable for most conditions. Change the setting when water
tracking speed display becomes unstable (due to air bubbles,
etc.), or to measure water tracking speed at a given depth.
Figure 18 MARK menu
Figure 19 AVR menu