Furuno FCR-2107 series, Operator'S Manual

Page: 52 / 556

2. Radar Operation
2-10
2. Push the right button.
SPD/CRS POSN
DR
LORAN
Off
°
kn
kn
kn
kn
DGPS-1st
NM
Ref tgt
kn
kn
kn
kn
kn
kn
(CALC)
SPD/CRS POSN
3. Select desired navigation sensors. Use the trackball to select Position sensors (GPS(s) either Primary or
Secondary then push the scrollwheel.
4. Open the SPD/CRS page, spin the scrollwheel to select the appropriate log then push the left button. Select
among LOG or Dual log (water): Log, speed thru water (STW) Dual log (bottom), speed over ground (SOG).
Note that a log cannot produce BT (Bottom Tracking) speed in deep waters without set and drift entry.
5. Click the Close window button (X) to close the SENSORS dialog box.
Notes on speed input
•
IMO Resolution A.823(19) for TT recommends that a speed log to be interfaced with a TT should be capable of
providing through-the-water speed (forward speed).
•
If a log is used as the water speed source, "(no pulse)" is used to indicate that a log device with closed contact
relay interface using 200 pulses/nm is not outputting pulses and thus the speed might be wrong. If Log is
selected and "no pulse" condition is detected, then the system generates the alert "405 Log data unreliable".
•
A single-axis water log cannot measure speed when the wind is coming from the leeway direction.