Skipper GDS101 - Soft Key Functions

Page 25 of 70
Edition: 2014.04.01
Chapter: 2. Operation
Soft key Functions
Gain
The received signal gain may be adjusted from 0 to 100 % to allow for optimal echo levels from bottom and
other objects. The gain setting affects signals from all depths. See “Fig. 2.2. Screen 1, Primary Operation
screen.” on page 13 and “Fig. 2.11. Screen 10, Oscilloscope screen.” on page 22.
TVG
Time Variable Gain may be adjusted from 0 to 100 % to allow for detailed echo control from the 0 - 50 m
depth range. A low setting will reduce the gain in the area near the surface to suppress noise and unwanted
echoes from this area. See “Fig. 2.2. Screen 1, Primary Operation screen.” on page 13 and “Fig. 2.11. Screen
10, Oscilloscope screen.” on page 22.
Digital indication
On the operation screens, two sizes of large digital depth indicators may be selected from “Fig. 2.3. Screen
2, 2nd Operation screen.” on page 14.
1. “Small” digits.
2. “Large” digits.
Frequency
The frequency selector toggles among 38*, 50 and 200 kHz. See “Fig. 2.3. Screen 2, 2nd Operation screen.”
on page 14. * Some units may have been adjusted to other frequencies.
Output Power
Power may be adjusted from 1 to 100 % in case of difcult shallow water conditions. Too high power in
such cases will possibly saturate the receiver or cause detection of unwanted secondary bottom or surface
echoes. See “Fig. 2.4. Screen 3, 3rd Operation screen.” on page 15 and “Fig. 2.10. Screen 9, System status
screen.” on page 21. Note: Power capability is transducer dependant.
Draught
Draught is used to correct the Depth Below Transducer (DBT) to Depth Below Keel (DBK) or to Depth
Below Surface (DBS). This is used when the transducer is not at same position as the lower part of the keel/
bottom, or if ship want to know the real water depth from surface. Draught may be compensated to allow
real depth from surface to be shown on the screen and printout. Negative draught values may be entered to
compensate for transducers tted above the keel. This setting also affects the NMEA transmitted values.
Draught value is indicated on the lower part of the screen by a ashing/alternating number. See “Fig. 2.4.
Screen 3, 3rd Operation screen.” on page 15. In addition, the oating depth on the right side of the screen now
also says DBS, DBT or DBK depending on the draught value.
Note: Be aware that if you have two transducers with the same frequency and use the ENS518 transducer
selector, the draught setting value will apply for both transducers.
Draught setting Right side additional screen tekst
Draught = 0 (Default) DBT
Draught > 0 DBS
Draught < 0 DBK
GDS101 Operation and Installation
SKIPPER Electronics AS