The fact is that it is not possible to determine the speed of large ships using tables and formulas. Therefore, special instruments are needed to be able to obtain the distance traveled in a certain period of time in addition to recording the ship's speed. From the past until now, mankind has tried to record the speed of sea vessels by inventing different tools in order to obtain the distance traveled during a certain time. The walker 7070 speed recording system is made exactly for this purpose. To calculate the distance traveled by recording the speed through the sensors and the processing unit.
What vessels is the WALKER 7070 MK2 in UAE suitable for?
Recording the electromagnetic speed is actually the main task of these systems. But the speed recording system of walker 4020 and walker 7070, due to the type of float on which they are installed, have differences from each other. Although the walker 7070 system is approved for all vessels, it works best on larger vessels over 500 GRT or over 50 meters in length overall.
Technical specifications of the walker 7070 mk2 speed recording system
It is possible to measure forward and backward speed in the range of -20 to +80 knots in this vessel. It also sends NMEA0183 and 200 PPNM signals to other equipment. The presence of a separate electronic unit P303 and indicator P1248 in this speed recording system allows a shorter cable to pass through the entry sensor.
The housing material of this electronic unit is rugged stainless steel. Because the stainless steel is suitable for use in wet environments and the entry sensor is installed nearby. The NMEA or 200ppnm signal from the P303 control unit is not as susceptible to external interference, so a marine grade data cable can be run over longer distances than the P1248 speed and distance indicator on the bridge.
Additional features of the device
- Has a built-in speed simulator
- Internal keyboard for calibration
- The possibility of installing the log display outdoors with a waterproof console
- It has a display based on OLED technology with the advantage of reducing power consumption
- The ability to provide clear vision and read values even at a distance (even at night)
- Built-in LED warning of the device behind the display for easy troubleshooting by operators
- Remote dimming unit P1275
- Ability to add an unlimited number of speed and distance indicators through chain connection
The application of the retractable log sensor in walker 7070
The Retractable Leg Sensor Garboard (P99) for steel hulls is supplied with a seal assembly (P98) which has been tested to meet GL requirements.
All speed logs sensors are supplied with a 50m cable and connect directly to the P282 main unit. For best performance, the maximum allowable distance between the sensor and the P282 main unit is 50 meters or less.
The way to calculate the distance traveled in this system is that a low frequency AC electromagnetic sensor induces an electric voltage in the sea water. This is detected by two electrodes on the sensor plate and then converted into a reading value on the main unit. The distance traveled is calculated by accurately integrating the value of speed with respect to time.