navman F440

[wild violet 38]

was wondering if i could replace head unit with another brand as I dont want to have to replace through hull transducer.head unit has power but wont turn on so am guessing its buggered,

[Island Time 1,252]

What is the transducer? Most brands use airmar transducers, so quite likely it could be reused, depending on model.

[wild violet 38]

sweet thanks IT how would I tell what brand transducer is is it written on it somewhere

[Island Time 1,252]

Yeah, hope so, but often not! Look for a sticker if no label on top.

[Island Time 1,252]

Is the through hull metal or plastic? So has it an insert and an outer tube, or one piece ? What's the diameter of the tube ? You may be able to just use the same tube, new insert and screen, or, use the same thru hull hole and new transducer. This is not an expensive sonar - the equivalent Lowrance would be like a Hook 4x, under $700 with thru hull transducer.

Give me a call if you'd like to discuss options. 0221539176

[wheels 543]

Navman used Pin 1 as depth + / Pin 5 as depth - and Pin 6 as shield.
If you are using the Speed/temp unit as well, Pin 2 is ground for Temp and speed, Pin 3 is signal for speed, Pin 4 is signal for temp
All you need to do is find out the pin config for your new Sounder.
The bigger issue will be power. The Navman 440 was 400W and 200Khz. You may find many newer units are 600W and that may be too much for the older transducer, plus they could be dual freq or a frequency inbetween.
When looking at specs, make sure you look for the apples and keep them separate from the oranges. RMS, Peak, or Peak to Peak power etc.

[wild violet 38]

Thanks for the info guys will head down to boat on thursday for a look and see what I have got to work with the head unit lights up but no pixels appear on the screen so am guessing its poked a very old unit