My boat is pointed in the wrong direction on my Raymarine C80 chartplotter?

It sounds like the fault is within the plotter itself. There should be any component, which shorts with main power supply, causes the blow of fuse to overload. I do advice you not to try to repair it by yourself, and contact the authorized service center.
Gopakumar Gopalan Google
Sophistacated testing instruments are needed to repair this type of devices.

I'm taking this as you want to send the gps information to your C80 not receive from the C80? If this is the case the brown wire on the garmin is the nmea data out +. The Black wire is considered nmea out neg (-) of the garmin. So hook the garmin brown to the white on the raymarine. Hook the black from the garmin to the green on the raymarine. That means you are outputting lat/long info to the raymarine from the garmin.

Look for map source in setting menu.

turn off the unit ,press and hold the no1 soft key ,keeping that key pressed press the power on button for 5 seconds this will force the unit to a full factory reset and reset the unit to its original
factory defalt setting

Call Mid-shore Electronics and speak to Ann. She may be able to help you out and have the chart shipped to you from Navionics. The number there is 410-228-7335.

The direction of the boat symbol is depending on the compass course from the autopilot. You will see that your GPS course (COG) and magnetig heading on the autopilot differs. Solution is to calibrate autopilot compass. Will advice you to not use course up, stick to north up or heading up.

1.try with a new software 4.29
if you have an old one like 2.14 you have a problem.
2. After this try you C 80 on a nother boat or Raymarine dealer
than you will know if the C 80 works

if your C80 is mounted outside the boat maybe water came inside the C80 .
This typ has a lot of problems with their seal.
Water comes to the keypad and the powerswitch dont work anymore

The C Series units have a specific cable that connects directly to the DSM. The GPS antenna has multiple wires that will need to be connected to the "SeaTalk" port on the C80. The SeaTalk cable comes with the display. The GPS connects as indicated in the following link :

http://raymarine.custhelp.com/cgi-bin/raymarine.cfg/php/enduser/std_adp.php?p_faqid=1359&p_created=1222441077&p_sid=aIunftHj&p_accessibility=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MTUsMTUmcF9wcm9kcz03LDczJnBfY2F0cz04NiZwX3B2PTIuNzMmcF9jdj0xLjg2JnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfbmwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD13aXJpbmcgdG8gQzgw&p_li=&p_topview=1

I don't have the sounder so can't address your question directly, but you can download all Raymarine manuals for your gear directly at www.raymarine.com