Question about Lowrance MARK-4 GPS/SONAR

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Can't get speed, water temp or depth on Lowrance marg 4

It did display them but during adjustments they disappeared

Posted by Anonymous on


5 Suggested Answers

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Posted on Jan 02, 2017

  • 594 Answers

SOURCE: When turning on the Lowrance

here is the link to your the lowrance web site. the trouble shooting guide says that if you tried to it on another boat than you might need to take it in for service. but there is a section that explains how to do a soft reset on the unit. you might try that.

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Posted on Aug 15, 2008

  • 10 Answers

SOURCE: I have a lowrance 522

I would verify that your "chart speed" is set to 100%.


Posted on Mar 25, 2009

  • 74468 Answers

SOURCE: lowrance 522c-gps combo, unit flashed during high

Tranducers must not connected while the system is ON. They are hi-frequency sound emitting devices, connecting it when the mother unit is LIVE, will make the transducer drive inside the device to fail. Here that has been happend I thinks. Just reset the system to its factory settings.


2* The unit asks if you want to reset all the options. Press ? to

YES'ENT. All options are reset, and the unit reverts back to the Map

Page at the 4000 mile zoom range. (Any recorded sonar logs or GPS
data will be unchanged.)

If this process do not help you, your GPS need service. We can't get any schematic diagrams or sevice manuals of GPS devices, as security reason, they will not be published. You must have contact the Lowrance Authorised Service centere at your town to get this device repaired. OK.

Posted on Jul 09, 2011

  • 74468 Answers

SOURCE: My Lowrance LMS-332C GPS was

If the GPS works and sonar section does not work at all, check the followings.

1# Check the power cable's connection at the unit. Also check the wiring

2# Make sure the power cable is wired properly. The red wire connects
to the positive battery terminal, black to negative or ground
3# Check the fuse.

4# Measure the battery voltage at the unit's power connector. It should

be at least 10 volts. If it isn't, the wiring to the unit is defective, the

battery terminals or wiring on the terminals are corroded, or the battery
needs charging.
Check whether there have any wiring break, loose. During servicing the boat, there is chance to get the wiring of sonar to sonar sensor at the botom of the boat may have damaged. Check these. OK.

Posted on Aug 29, 2011

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1 Answer

Need a repair shop for GPS,Fisher

Hi Clarence
Although the problem COULD be a faulty depth transducer, in my experience this is usually caused by a cabling problem, either there is a poor connection at the display unit, a poor power cable connection, RF interference from another device or the cable has been pinched causing an intermittent fault. After making SURE the power cable is tight, I'd clean the connections, then inspect the cable looking for an area that has been stressed. If you have a VHF radio nearby, try shutting that down during your testing. If depth reads normally, you know where your issue lies.

Good Luck!

Oct 27, 2014 | Lowrance PARTS - LOWRANCE 15FT EXTENSION...

1 Answer

Lowrance troubleshooting

Pay attention if depth readings shift during times when moving from spot to spot at higher speeds. If this is the case then you have air bubbles disrupting your sonar signal causing inaccurate readings or a loss of bottom lock for the unit. If over this weeds in shallow water, this at times creates havoc with sonar readings because of the wide variance of signal returns.
check the voltage at the head unit.You should have a minimum of 11.7 volts. 12.5 to 13.5 is optimal
lower power input can affect the overall performance of your unit.

Sep 04, 2014 | Lowrance Boating

1 Answer

How do i find water depth

Water depth should show automatically on your sonar page.
if it does not then either you have selected "stop sonar" under your sonar options or you have opted to turn off the depth displayou so the numbers don't show up.
if you areally viewing your GPS or split screen sonar/GPS page, sometimes the depth display is not visible on these pages unless you specifically instruct the unit to display it.
Lowrance HDS 5 Gen2 Fishfinder GPS Chartplotter
Here is a link to Lowrance where you can download a pic version of the operators manual.
Go to page 11 "overlay data" this will give you a step by step of how to add data or readouts to different screens.

Aug 27, 2014 | Lowrance HDS 5 Fishfinder GPS Chart...

1 Answer

My fishfinder will not continue to read shallow depths as well as in shallow depths when drifting and occasionally running across the water. My unit is a lowrance 522c color gps/fishfinder.

Hello. Your observation is spot on and it is actually a characteristic that is always true when using sonar. Yes, your Lowrance uses the same sonar as a nuclear powered submarine does. The two factors you focus on, water depth and boat speed are perhaps, the two biggest factors when it comes to the quality of the fishfinder. The boat's engine should be in gear at an idle or just above. Experiment with your boat to find the best throttle location for good arches. Usually, a slow trolling speed works best. The depth of the fish can determine if the fish will arch on the screen. If the fish is in shallow water, the fish is not in the cone angle very long, making it difficult to show an arch. Typically, the deeper the fish, the easier it is to show an arch.
If you would like a complete tutorial on Lowrance sonar, go to this link. Enjoy.

Nov 20, 2009 | Sport & Outdoor - Others

1 Answer

Built in transducer is not picking up/transferring depth to graph

I havew a Minn Kota trolling motor on a Z21 Ranger. Minn Kota has a built in (puck type) transducer on the motor. I have a lowrance 135x on the front. The lowrance will read the temp but will blink the depth. I switched out the depth finder with another 135x with the same results. I have a 522c gps unit networked together and mounted on the console that works fine. Any suggestions on the problem with the 135x?

Jul 27, 2009 | Minn Kota Maxxum 70 Universal Motor/Sonar...

1 Answer

X510c most of the time it reads 1.6 for the depth, it flashes 1.6 then it will go to the correct depth for a shqrt time then get stuck on 1.6 again some times other depths but mostly 1.6

Does this occur at any depths...over 20ft even.

The X510c will have problems keeping depth in shallow water...especially if it is muddy, weedy down there.

If the problem occurs even in depth over 20ft, then try resetting the unit:

1. Turn unit off
2. Press and hold ZIN, ZOUT, and PWR until you see the depth (flashing or not) in the top left corner.

If the problem still occurs, make sure the transducer is clean and still mounted so that it is sending the signal straight down to the bottom.

If the problem still occurs, make sure the power is good. You can have the voltage displayed on the screen through the overlay data menu.

Does the problem occur at any speed? If the problem clears up when you stop or slow down, the problem is due to cavitation and the transducer will need to be moved to a location where it is in a smooth flow of water at all speeds.

If none of this helps, there may be a malfunction with the X510c. You can try to update it but you will need to get the software update from someone at Lowrance support and then find a way to connect your X510c to a Lowrance unit that has a memory card slot via a NMEA 2000 network. I can help you with this if you need.

Other than that you can have the X510c returned to the factory for service.

Jul 09, 2009 | Lowrance Boating

1 Answer

Lowrance x96 does not function after 20 feet depth

Your transducer needs to be adjusted so the return signal can be picked up. Some of these have to be super tuned to receive the signal. Also the transducer may be moving ever so slightly when the boat is traveling at speed. You may have some water turbulence interference all contibute to signal return.

May 26, 2009 | Lowrance X96 200khz Fishfinder

1 Answer

Garmen 240 fishfinder

A test bucket wont work, A 200 khz transducer will generally not work in anything less than 2' of water, due to surface clutter. If the transducer is working, you should hear it make a ticking sound.

When you got the 17000 foot reading was your range set to auto?

How is the transducer situated on the boat? Sometimes turbulence and bubbles from the hull can cause erroneous readings, including unrealistic depths, or no depth at all. Stop the boat and turn off the engin e and anything electrical to see if problem repeats itself. If it only crops up when the boat is moving then it is most likely the transducer location.

Jul 26, 2008 | Garmin GPSMAP 235 Sounder GPS Receiver

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