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Can Garmin 740s and 541 do depth simultaneously?

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Can Garmin 740s and 541 do depth simultaneously?

Old 07-30-2017, 12:09 PM
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Default Can Garmin 740s and 541 do depth simultaneously?

I have a 740s (with B60 thru-hull x-ducer) that's starting to act weird, and I'm beginning to not trust its depth readings. Everything else in it is great, but sometimes depth works while other times it may go to 1.9 ft and lock, or maybe just quit updating depth altogether, until I do a restart.

I really want a new unit (like the 942xs etc) but there's no console space for a larger unit, and little room in the budget either, for that matter. I can get ahold of a 'gently-used' 541 (and transon xducer) for little money, and I'm considering getting it for my main sounder and using the 740s as plotter/wx/etc, and as a redundant sounder (when it's working).

My question is: can I use the sounder functions from both units at the same time (using the separate xducers), or will they interact or interfere with each other somehow?
Old 07-30-2017, 12:22 PM
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Yes you can. run one sounder at 200kHz and the tother at 50Hz and they will not interfere.
Old 07-30-2017, 04:27 PM
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Thank you very much. That helps with the plan-forward.

In trying to get my head around the concept of using multiple sonars at once, if both were set for - let's say the 200khz range - would they both 'transmit and receive' on exactly the same frequency (ie, 200,000.0 Hz +/- 0 Hz)? Wouldn't there be some amount of internal offset between the 2 units representing each one, just by nature of having two different sonar units? Otherwise, if I was to be in the vicinity of several other boats (all with 200kHz sonar on) wouldn't it be like trying to hear one person talking normally at rock-concert ? ;?
Old 07-31-2017, 07:21 AM
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Originally Posted by dogdad1 View Post
Thank you very much. That helps with the plan-forward.

In trying to get my head around the concept of using multiple sonars at once, if both were set for - let's say the 200khz range - would they both 'transmit and receive' on exactly the same frequency (ie, 200,000.0 Hz +/- 0 Hz)? Wouldn't there be some amount of internal offset between the 2 units representing each one, just by nature of having two different sonar units? Otherwise, if I was to be in the vicinity of several other boats (all with 200kHz sonar on) wouldn't it be like trying to hear one person talking normally at rock-concert ? ;?
I'm not an expert, but i don't think the sonar is accurate enough to recognize its own signature in the sonar ping. The transducer is a piezoelectric ceramic element. It pings and measures the time for the sound to return. You mention specifically the 200kHz frequency which has a very narrow cone so you would have to be pretty close to another boat to hear their pings. A wider cone like that of a 50kHz tone may be more likely to interfere. If the timing of the pings lines up between two sounders you can see interference, it tends to look like a solid vertical line on the screen and for the most part isn't that awful to deal with. I have not encountered this many times though.

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