20 Most Recent Garmin GPSMAP 235 Sounder GPS Receiver Questions & Answers

You will need to get G Charts directly from Garmin.

Backlights are part of the LCD display and consist of LED's. You may have to replace the entire LCD display or find another display that is cracked but has a working backlight. In most cases, you can swap backlights. There may be some soldering involved.

Some 235s had a problem with the contrast setting. When the contrast is set to full the screen turns black.

When you turn on the GPS and the screen goes black, try tapping the left arrow on the track pad a few times. You should see the screen start to lighten. If that doesn't work, tap the power key and try tapping the left arrow a few times.

Hey I too have a Garmin 235S GPSMAP, I am looking for the G-Charts, Have you found any source yet ? reach me at [email protected]
Jim

Hello
Garmin doesn't supply technical repair books or parts to the public, since this is a hard fault in the GPS circuit board you will need to send it back to Garmin for repair or exhange. Below you will find the contact information for Garmin's repair service.

http://www8.garmin.com/support/outofwarranty.html

Thanks for the comeback.

Problem was my antenna wire. Somehow the wire wore through where it went through the hard top. Probably due the the high winds we had this winter which caused the cover to rub and pull against it.

Thank you

CJ

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.

Have a look on their web site; https://static.garmincdn.com/pumac/GPSMAP_78_OM_EN.pdf&vssid=collectionitem-web-desktophttps://static.garmincdn.com/pumac/GPSMAP_78_OM_EN.pdf

I suggest you try resetting the device by following the instructions in the owner's manual. If the issue persists, it may be due to an error in the map database. You can try reinstalling the maps to the memory card after unlocking them for your device. If you are still experiencing issues, please contact Garmin Product Support for further assistance . Correcting the Message "Can't Unlock Maps" or "Can't Authenticate Maps" on a Garmin Automotive Device ' Garmin Customer Support

By 'resetting' you mean it switches off, and because it is connected to power, it boots back up. Do you have a SD Card in it? I had trouble with a Nuvi 1350 with SD Card that had the whole USA Map on it, mine came with the Canada Map only. It would randomly turn off, so I decided to buy a Factory Refurbished Drive 50. I removed the SD Card and Reset the Nuvi and it worked perfectly after that. The Drive 50 was also a bit flaky, and resetting fixed that as well. You can back up your Favourites beforehand.

I recently purchased a Garmin GPSMAP 78s I had a lot of trouble calibrating the compass; I literally tried it hundreds of times without success. I also did a hard reset etc etc. Believe me I definitely tried everything possible but to no avail I did contact Garmin but they didn't have an answer straight away for the problem I have now sorted it as follows: Do each step VERY SLOWLY, MUCH slower than you think you should There are three steps to go through in calibrating the compass 1)Spinning the whole unit around flat 2)Flipping it over longitudinally and then 3) Flipping it over end to end. But remember do each step VERY slowly and go to the next step when prompted by the unit This solved my issue. I can now calibrate my compass 9 out of 10 attempts Hope that helps