JRC JLN-550 Instruction Manual page 29

Operating mode
Setting
AUTO
BT
WT
GPS
Speed Display
Display
Mode
BT
WT
GPS
Digital Interface (IEC 61162-1) VBW Output
Data Field
Mode
BT & WT
GPS
The details of each operation mode
AUTO (the BT /WT automatic switching mode)
•
A ground speed is indicated when the depth of water from hull bottom is in the range of about 2 -
250m. While a ground speed is indicated, both of the AUTO lamp and the BT lamp are turned on.
When the depth of water from hull bottom becomes deeper than about 250m, automatically
changes in the water track mode. Both of the AUTO lamp and the WT lamp are turned on during
the water speed indication.
Even if the depth of water from hull bottom is more than 2m, a ground speed can't be sometimes
measured in the case such as the mud that the sea bottom absorbs a sound wave to. It changes to the
water speed indication in such a case.
And, even if the depth of water from hull bottom is under 250m, a receiving signal sometimes
decrease too much in the sea area where seabed inclination is big and ups and downs are drastic.
Operation
BT /WT automatic
Force BT
Force WT
Based GPS
Fore/After speed
Indication
Indication
Indication
Water Speed Data
Doppler measuring
Doppler measuring
Mode Lamp : Blinking in 2.5sec. interval
AUTO + BT : Bottom-Track measuring mode
AUTO + WT : Water-Track measuring mode
BT : Forced Bottom-Track measuring
BT : Bottom-Track is lost(Data is hold)
WT : Forced Water-Track measuring
WT : Water-Track is error(Data is hold)
In case of the depth shallow then 3 meters.
GPS : Speed based upon GPS data calculating
GPS : GPS or GYRO is error(Data is hold)
Port/Starboard speed
Bow
Indication
NO
Indication
Stern
Indication
NO
Indication
Ground Speed Data
Doppler measuring
GPS data calculating
4. Operation 19