1 Introduction
The Explorer D310 measures and displays the depth of the water. An installed Explorer D310 usually has two parts:
The display unit.
A depth transducer, which is attached to the hull and wired to the display unit.
The unit is powered from the boat’s power supply.
The Explorer D310 is part of the Northstar family of instruments for boats, which includes instruments for speed, depth, wind and repeaters. These instruments can be connected together to form an integrated data system for a boat (see section 4).
For maximum benefit, please read this manual carefully before installation and use.
How the transducer measures depth
The depth transducer generates an ultrasonic (sound) pulse, which travels down through the
water. When the pulse meets the bottom, some of the pulse is reflected back up towards the boat and is received by the transducer.
The display unit analyses the reflections from each pulse. It removes unwanted reflections (from bubbles and other objects) and calculates the depth by measuring the time between sending the pulse and receiving its echo.
Cleaning and maintenance
Clean the display unit and any plastic transducers with a damp cloth or mild detergent. Avoid abrasive cleaners, petrol or other solvents.
When repainting the hull, cover or remove any visible transducers. Depth transducers may be coated with a thin layer of antifouling paint; gently sand off any previous paint first.
The Explorer D310 display unit
Display |
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| Alarm symbol |
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(backlit) |
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| Display normally |
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| shows depth |
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| Depth units |
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Four keys |
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| 111 x 111 mm | ||
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(backlit) |
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| (4.4” x 4.4”) | ||
2 Operation
2-1 Turn on and off
Turn the unit on and off with the auxiliary power switch on the boat. The unit does not have its own power switch. When you turn it off, any settings you have made are retained.
If the word SIMULATE flashes at the top, left of the display, then the unit is in simulate mode (see section
The unit has four keys, labelled 
and 
. In this manual:
Press means to push the key for less than one second.
Hold for two seconds means to hold the key down for two seconds or more.
Press one key + another key means to push both keys together.
4 | Northstar Explorer D310 Installation and Operation Manual |
