20 Most Recent Furuno GP31 GPS Receiver Questions & Answers

The only place to get that screen is through a Furuno authorized dealer. The unit is sealed and gas filled to remain waterproof. You're best bet would be to send the unit in to Furuno for repair. You wont save much doing it yourself because the cost of the screen makes up most of the cost of the repair. They will also make sure that all the software is up to date for the new WAAS satellites that recently went on line.

Have you tried adjusting the contrast? On that model I believe you tap the power key while the unit is on and you will see 2 sliding scales on the screen, one for brightness and one for contrast. Up or down arrows select the scale and left or right arrows adjust it. If the contrast and brightmness aren't tied into the power key on that model, they're somewhere in the set up menu.

If adjusting the contrast doesn't help then the screen has most likely failed. This is commonly caused by old age, however repeated exposure to extreme heat or cold can cause premature failure.

Furuno GP31 GPS... | Answered on Jan 23, 2019

Is this a request for a GP31 Manual? I have posted
http://www.offscotland.plus.com/Temp/GP30-GP35-Operator's_Manual.pdf which is basically the same beast.

Furuno GP31 GPS... | Answered on Jul 30, 2014

I have posted the Operator Manual at

Use this to check out section 7-10 to make up a cable to connect to a PC to allow download of data. Then, using the manual as a reference figure out the sequence of buttons to press to get the GP31 to download the waypoint and route data to the PC. Just press the buttons and assume the display is showing the next prompt. If you know someone you has a working GP31 get them to do the sequence and write down the buttons they press. You just copy the same sequence. You will need some software on the PC to capture the data,

Furuno GP31 GPS... | Answered on Jul 30, 2014


According to your problem, first reset the GPS device. Reset the antenna. Make sure your position that the antenna can receive the network. So set the position properly. You may need a firmware update for the device. If it doesn't solve your problem then you can reload the software of the device. You may have to replace the antenna. But before that, check the connection of the antenna properly.

Furuno GP31 GPS... | Answered on Aug 23, 2011

The blue cable is the reférence 0 (ve-) for Receive Data (ve+ yellow wire) and for send data (green wire)
The function is the path return for the data transitting on the nmea bus. If not connected the return is made by the way of the ground of the véhicle if it is connected. othewise the nmea won't work.

It should be équal to the potential 0 Ground (if the ground plug is connected) but it could be a little different. The purpose is to isolate the minus of batterie from the ground, wich is very useful on a metalic vehicle (an aluminum boat for example).

Furuno GP31 GPS... | Answered on Apr 16, 2011

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