20 Most Recent Garmin 200/50khz, 10/40deg, Plastic, Transom Mount, Depth, Temp Questions & Answers

Connect your USB Cable to your Computer and Garman and download this to check for updates
http://www8.garmin.com/products/webupdater/howtoinstall.jsp

Then Maps
https://my.garmin.com/maps/checkPlugin_updates.htm?deviceType=other&

Look Here. Download the manual and follow instructions.https://buy.garmin.com/shop/store/manual.jsp?product=010-00289-00&cID=168&pID=196&ra=true

Hi


Try disabling the France map by going into Tools-> settings->Map. After this go to Map info and check the map to enable it or disable it, if it’s not working restart and try again. However, try to restore the map by selecting restore option.
If you are unable to resolve the issue then you'll need to reset your GPS device. Depending on the model of your Garmin 256 you can reset by pressing the reset button on the bottom of the unit. If you are unable to find the reset button then slide the power key to on/off position and hold it for 10 seconds.

Please post back for any further assistance. If you are satisfied please do accept the solution.

Daniel

I believe like my own Garmin I have a 178 which is the mono version, same transducer though, you alter the frequencey setting in your main reciever set up program.

All transducers should read 0 ohms or close to it. If not you most likely have a broken pin in the connector or wire.

I can't remember correct setup but make sure that box is powered and connected to GPS in right input. With no power to box it won't be discovered by head unit.

Place your ear against the transducer with unit ON. You should hear it 'tikking' ( tic tic tic ) then the transducer is ok...

garmin_products_out_of_support_list_20140207 Here is a pdf for Garmin. you should be able to contact them though email. Good luck

https://www.garmin.com/en-US

Check you transducer cable route and connections. Look for kinks, punctures, & tears in cable. Visually check the transducer for damage. #2 check the units operation on a friends boat with the same set or research a local marine repair shop to check ops. Best of luck on the problem.

Hi You'll need to identify and connect NMEA out (+ and -) from your 451 to NMEA in (+ and -) to your VHF to get it done. Hope this is helpful. -Steve

Hi Tom! I believe I'd start troubleshooting with the power supply. Disconnect and clean the cable ends with Fluid Film (I swear by this stuff) Check the crimps and make sure they're not loose. Pay special attention to the ground connection. With your temp not reading correctly in addition to your depth rolling, this usually indicates a common fault. (Usually ground.) Check the data cable and socket on the control head for corrosion (again, Fluid Film is your friend) If that doesn't fix your problem, then a "hard boot" or reset of your system might solve the problem(s). Hope this helps you out. Good Luck! -Steve