Could you please let me know witch transducer to use with gsd 21

1 turn off the simulator in the menu.

if that does not work

2. Check the connection to the transducer, if it is unhooked or corroded, clean and reattach the connector, the unit will stay in simulator mode if it does not detect a transducer attached to it

I am not a vet but my GSD had pannus which is incurable. Corticsteroids were prescribed to treat it. Keeping out of bright sunlight often helped

In the main menu of the sonar/plotter there is an option to turn on/off the sounder. press menu, then navigate through to sonar settings.

Has this unit worked in the past, or are the transducer and the unit itself new? Is this a Lowrance LMS-240 as indicated before your question?

Please let me know and I can help you out here.

Thanks, just reply here,
Tim

You can find out which one is serving the device you wish to repair by waving a small spade or wide metal object about a foot from each of the existing transducers and have someone else monitoring the insruments on the concole.

What color wires are coming off of your power data cable from the plotter?

I think you need to level the transducer. You have it pointed way out in front of you so that when you're going fast it is able to bounce the signal off the bottom and it comes back to where the boat has traveled to. When you're going slow you're bouncing it out in front of you but it comes back up in front of you. Sorry but I can't find a picture of a Garmin transducer. Hope this helps.

Interference like that is usually caused by electrical noise. Does it happen when everything else on the boat is turned off? If the answer is no, then you can isolate the source of the interference by turning things on one at time. Follow your transducer cable and make sure it has not been damaged or altered in any way.

Also make sure that your gain is set to auto

The GSD 21 has an LED indicator light on it. If it detects a malfunction the LED will flash in distinct colors or patterns. In the troubleshooting section of the owners manual there is a list that explains what each flash pattern means.

I'm not sure what you mean by "cannot get the sounder to power up". Are you not getting power to theGSD20, or are you not getting the sounder to display on the screen? I can probably help you with this but I need some more information.

If you are getting power to the GSD 20 sounder, it will have a flashing LED next to the cables that plug into the GSD 20 box. What color is it and what is the flash pattern (how many flashes, and fast or slow?) When you power up the GSD20 does the color or flash pattern change.

I'll watch for your response here.