JRC JLN-550 -, Инструкция по эксплуатации

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4. Operation 19
Operating mode
Setting Operation Mode Lamp : Blinking in 2.5sec. interval
AUTO BT /WT automatic
AUTO + BT : Bottom-Track measuring mode
AUTO + WT : Water-Track measuring mode
BT Force BT
BT : Forced Bottom-Track measuring
BT : Bottom-Track is lost(Data is hold)
WT Force WT
WT : Forced Water-Track measuring
WT : Water-Track is error(Data is hold)
In case of the depth shallow then 3 meters.
GPS Based GPS
GPS : Speed based upon GPS data calculating
GPS : GPS or GYRO is error(Data is hold)
Speed Display
Display
Mode
Fore/After speed Port/Starboard speed
Bow Stern
BT Indication Indication Indication
WT Indication NO NO
GPS Indication Indication Indication
Digital Interface (IEC 61162-1) VBW Output
Data Field
Mode
Water Speed Data Ground Speed Data
BT & WT Doppler measuring Doppler measuring
GPS Doppler measuring GPS data calculating
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.