Can you stop waves affecting the floor on the sounder ? I have a lowrance elite 4x hdi

  Is there a way to make the floor of the ocean stay flat while waves and swell push the boat up and down it sounds like a Newby question and I feel kinda stupid asking but makes it very hard reading the bottom when every time a swell wave goes through your picture jumps up and down by the same amount is it possible or is there some trick I am missing ? help .......


scano's picture

Posts: 869

Date Joined: 31/05/07

It's called bottom lock

Wed, 2017-08-02 23:02

if it is a feature enabled within the lowrance S4, give it a go and fine tune the settings.






Posts: 163

Date Joined: 19/06/14

We're all full of stupid questions

Thu, 2017-08-03 08:24

No point in keeping em stuck in our heads, better off to ask ( that's why we're all here right? ) than to have it go around and around and around in our brains only to arrive back at the same conclusion . My question to all. Any ideas as to how I can work out the magic formula to make this wind PISS OFF and find some fish.... 


 My wife understands why I clean my rods n reels in the shower....


Posts: 129

Date Joined: 08/09/11

good answer

Thu, 2017-08-03 12:29

 Thats a good answer, Silver Fox, my question is how do you get the wife to understand, my wife thinks i should build another shower in the shed.

ranmar850's picture

Posts: 1286

Date Joined: 12/08/12

Out of luck

Thu, 2017-08-03 12:07

 No bottom lock on 4x HDI. Only found on HDS range, in Lowrance. Up and down will give you corresponding "waves" on the bottom reading as the measurement between your transducer and the bottom changes--also be aware the roll, side to side, will give you intermittent longer strokes, due to differering return times of transmitted signal, very difficult when trying to pick the transition between hard and soft bottom. 

Posts: 163

Date Joined: 19/06/14

Easy Marrisy

Thu, 2017-08-03 16:05

 Build the new shower in the shed, ask her what type of tiles and shower screen she wants in her new bathroom!!! 


 My wife understands why I clean my rods n reels in the shower....


Posts: 276

Date Joined: 23/04/14

There is, but it's not cheap

Thu, 2017-08-03 16:57

For Furuno at least, you can use a satellite compass, which when networked with an FCV1150 provides heave, pitch and roll compensation to the sounder.  Works brilliantly, but it's a different class of gear than the Lowrance.




crano's picture

Posts: 359

Date Joined: 04/11/09

Why not

Thu, 2017-08-03 18:11

 I dont know why we can not have swell compensation on a combo.A gps can read altitude so why cant they add some programming to sort this out. 

I have been told that the digital compass that furuno have that can fix this will set you back 3 to 4 grand.

Posts: 3211

Date Joined: 01/02/10

 Raymarine you get it in a

Thu, 2017-08-03 18:38

 Raymarine you get it in a combo for much cheaper


Does anyone know where the love of god goes, when the waves turn the minutes to hours?

Posts: 276

Date Joined: 23/04/14

Not that simple

Thu, 2017-08-03 19:46

Altitude is the least accurate of the data that a GPS can provide, and regular receivers are not sensitive enough.

The Furuno satellite compass has a pair of high precision GPS receivers and a set of accelerometers to measure yaw, pitch and roll. 




crano's picture

Posts: 359

Date Joined: 04/11/09


Thu, 2017-08-03 18:47

 I know raymarine axiom has a gyro to take out the roll but does it have swell compensation ?

Posts: 3

Date Joined: 09/09/16

 Thanks for the feedback

Thu, 2017-08-03 19:24

 Thanks for the feedback

t bone's picture

Posts: 328

Date Joined: 20/04/14

Heave compensation

Sat, 2017-08-12 15:26

I run a combination of simrad and lowrance on my boat and have got the ability to use "heave compensation"

As mentioned above thou, its not cheap, but if matched the NSS series sounder with the correct GPS unit, its achievable. I have spoken to navico support thou, as far as im concerned its not perfected yet as the calibration process or lack there of limits the accuracy of algorithms involved.

Bottom lock is the best option that a lot of people use. and depending on what transducer your running, the amount of pitch and roll will cause issues also as ranmar mentioned.


GDOFC Committee Member.