What speed can I use a humminbird 140 c - Humminbird 140c Fishin' Buddy

I am having an issue getting my brandnew 140 C to turn on. Fresh batteries... Called customer service, they want me to send it in. Ill update you when I find out what the issue was...

One thing you might try is restoring the defaults in your unit. One other thing is go into the menu under the sonar tab and adjust your Noise Filter. You may have some type of interference going on. You can call our customer service department and they will trouble shoot it for you. Our number is 800-633-1468.

Joby from Humminbird.

I had the same problem. I talked to 3 different technicians on the Humminbird support line about it. All 3 of them confirmed that this is how their technology works. They ping the GPS satellites continuously, and at low speeds the GPS accuracy causes the speed measurement to fluctuate wildly. It smooths right out when you go faster than 3 MPH, since your boat moves far enough at that speed that the GPS accuracy is no longer a problem.

Seems like they could easily overcome this issue by averaging GPS readings over a longer time period at low speed (i.e. give the boat enough time to move far enough to eliminate the accuracy issues), but they don't do that.

It was a big issue for me since I do a lot of trolling at low speed and need an accurate speed indicator, so I returned the product and bought a Lowrance instead. Lowrance doesn't have this issue.

More than likely you have your sensor run underneath the boat and therefore the sensor is directly in the water. When you speed around the hot water on top is what your sensor is picking up, when you slow, you are allowing the sensor to pick up on the colder water just inches below the surface

hello there:
here is a few links that have the manual that you can download for free

1. Humminbird 595C Manuals, Support and Troubleshooting - Fishfinder GPS Free download of Humminbird Fishfinder 595C User Manual. ... Humminbird Fishfinder 595C GPS. Need a manual? HUMMINBIRD 595C MANUAL ...www.retrevo.com/support/Humminbird-595C-GPS-manual/id/540ag515/t/2 - 96k - Cached
2. Humminbird GPS Manual and Support Information: User Manuals: Retrevo ... largest collection of user guides and manuals on the web. ... Humminbird Fishfinder 595C. Operations Manual. Humminbird HDR 400G. User Guide. Humminbird HDR 400I ...www.retrevo.com/samples/Humminbird-GPS-manuals.html - Cached

most graphs are....... UNLESS damaged or dropped....see you on the water...GL

Is it possible to install the thermostat upside down?

Hi!
Installation of the speed/temp wheel is quite easy, here's a manual:
SW Speed & Temp
The new sensor cable plugs into the square plugin in back of your Humminbird....it's the small square connector with 4 holes.
Best of luck!
Mike

Wiring should be very straightforward, the connector on the left (looking at the back of the sounder) is the plug for the transducer, the 2 pin plug in the middle is for the power (notch in the plug cord points UP), and the 4 pin connector is for the optional speed and/or temperature sensor. Here is an install manual for your reference:
http://www.humminbird.com/PDF/Piranha1_2_IN.pdf

It has an online manual to download.
do a search for humminbird 140c.
some portables only work at very slow speed or sitting still in water.