Printable View
I have a blue outline around a certain feature at the top of the 2d display image below (HB and Lowrance both have it)...
1. What is this feature...??
2. How is the data collected for this feature...??
3. How can this feature be used on the water...??
Attachment 273085
Rickie
Gonna have to wait and let someone else take a stab at this one but I will stay tuned for answers
temperature gauge that gives the temp for a certain length of time,and this way you do not have to watch it all the time,u can check and tell if where u are headed is getting warmer or other way to help find better water temp
Have noticed but never used this! Looking forward to the answer, so I can learn something for today! Genec's post above seems logical to me. Had to look it up and won't give away the answer! I can say HB has a less than ideal explanation of said feature, at least that I could find.
+1 what genec said........it can help you see temperature trends that could be especially useful in spring to find the warmer water and more active fish.
+2 for Gene's answer. I use this feature some.
Great answers guys (and correct also)...
Now Sonar Quiz #14.5...
What determines the actual numbers assigned to the upper and lower scale ...(displayed at the left of the Temp trend scale)...??
Rickie
surface water temp at the transducer would be my guess.
x2! and it is just a guess. Can't logically think of another way to derive at it. Well after looking a little more, I don't think it is that simple! Guessing again, HB takes initial reading add's +10 above and -10 below and charts in between?Quote:
Originally Posted by cause
Agree with Redge.....plus/minus 10° of the average temp
Nope...surely NOT an average temp. Air temp?
I would think that the initial temperature measurement is used, but could be an average of the first several; however since signal from transducer will be continuous this would have to be the first several readings the unit's processor makes. Clear as muddy water, huh?
I was guessing that it took the initial reading from the TD, then just plotted the new temps from the TD as they come from the TD. Not sure on time frame for sampling from TD. i.e. you get on the water and it gets 74 degrees first reading from the TD, then it just plots the temp as it gets new readings. So according to the image temp has risen almost 5 degrees from where you started according to the pic? Just a guess!!!!
Patiently waiting on the real answer!
The screenshot in the OP was taken from the HB website...Quote:
Originally Posted by Redge
(See next post for my 1197 screenshots with explaination)
Rickie
So I took some screenshots from my 1197 in my garage...(the temp sensor works out of water in normal mode- correct depth does not)...
In this 1st screenshot below...you can see the temp graph and it's number assignments (71°-91°)...immediately after I turned on the unit...just as the screen started to scroll...
notice the temp in the bottom readout box is the ambient temperature of my garage (81.2°)...and the "upper" and "lower" temperatures assigned to the temp graph are 10° above and below the ambient temperature sensed by the temp probe at startup...
---------------------------------------------------------------------------------------------------------------
Attachment 273086
__________________________________________________ _____________
__________________________________________________ _____________
In this 2nd screenshot below...while the screen was scrolling, I had placed my thumb on the temp probe to get the temp probe to sense my body temperature....
notice the trend line in the temp graph has steadily risen as the screen scrolled to the left...the 86.3° in the readout box at the bottom is the temperature that the probe sensed my thumb temperature
also notice the numbers assigned to the temp graph at startup (71°- 91°)...did not change as the temperature was rising with my thumb on the temp probe
----------------------------------------------------------------------------------------------------------
Attachment 273087
__________________________________________________ _____________________
__________________________________________________ _____________________
In this 3rd screenshot below...I had powered the unit off...and powered the unit back up (with my thumb still on the temp probe)...
notice the temperature in the readout box still at 86.3° (with my thumb still on the temp probe)..but now the "upper" and "lower" numbers assigned to the temp graph are 10° above and below the new temperature (86.3°)...sensed by the probe as soon as I powered on the unit...
---------------------------------------------------------------------------------------------------------
Attachment 273088
__________________________________________________ ________________________
__________________________________________________ ________________________
So the numbers assigned to the temperature graph are 10° above and below the temperature sensed by the temp probe on startup...(or maybe an average of the 1st few initial temp readings ...as cache stated)...
These assigned numbers on the temp graph at startup will stay active...until the unit is powered off and powered back on...
Rickie
Inquisitive minds want to know, how often does HB sample or collect the temperature?
I'm sure it's "plotting" the new temperature every time the unit "paints" a new vertical row of pixels...but the sample rate I'll have to let Greg answer...Quote:
Originally Posted by Redge
The temp probe in the xducer has it's own dedicated wire channel...so it may not be tied to the actual ping rate of the sonar signal...
Rickie
Sounds like quiz 14.5a..;)Quote:
Originally Posted by Redge
RICKIE,U R SNEEKIE,SNEEKIE:Rofl,U GOT MOST OF US ON THAT ONE
I like quizzes that help some users go...ah ha!!Quote:
Originally Posted by genec
Rickie
So is their any advantage to using it???
Depends on how good your memory is.....Mine's getting bad.;)Quote:
Originally Posted by brush pile
Did you know that 800khz tone travels faster thru hot water than cold water?
If you knew this, then approximately how far will a 20 ms burst of 800khz pure tone travel in 2 seconds in 100* fresh water?
Jeez, I feel like I am back at work. Thought I got past all this when I retired. When they gonna have one that has an arrow pointing down and says "Fish Here!!" ???
Old retired AT&T Electrical Engineer. :Doh:
CP, 9724'? That's a wag, not even a swag! If you don't answer here send me a pm, or you will drive me crazy! Ah em crazier!!
You are close. If you know the speed of sound thru fresh water, you will get close.Quote:
Originally Posted by Redge
Haven't found the equation for how much faster it moves through less dense water. Yet!
10,000 feet
9,990' after doing a little more looking. I was amazed that waves travel this fast, had no idea!!
I have 798.......I don't remember seeing this. Is this something on the 1198 or a new update? Prolly my aging brain!:confused:
If your asking about the Temperature Graph in the OP...Quote:
Originally Posted by ricky
It's under the Sonar tab in the main menu system...
Rickie
Cane pole, i am surprised that a man with your intellect and knowledge would ask such a simple question. Just to show you how easy it is i am going to ask RNVINC to answer that question.:highfiveQuote:
Originally Posted by Cane Pole
4920 x 2 = 9840' in fresh water....Quote:
Originally Posted by Knappy
How SONAR Works | Vexilar Fishing Electronics
I cannot find the effect to equate the 100° water factor...
I found this but it's more about salt water...
NAVAL SONAR - Chapter 1
Rickie
Here is where I found it
Water - Speed of Sound
Great link Redge...Quote:
Originally Posted by Redge
I'm saving that one...
Everything I found always says "approximate"...
Rickie
Checked yesterday... I don't have it.Quote:
Originally Posted by rnvinc
I'm not sure why the 798 doesn't have this feature...Quote:
Originally Posted by ricky
The manual for the 798 and the 798HD do not show this feature...but yet the manuals for the 800/900/1100 series units do show this feature...
I don't know ricky...maybe Greg can give us some insight when he gets back from vacation....
Rickie
Vacation? I’ve been tied up with training classes again! Now that it is doe there is some vacation time that I need to use up…
The Temperature Graph feature is only on the larger sized units, not the 798/798 HD sized units.
Thanx