Question about Lowrance LMS-337CDF GPS Receiver
After a few different people told me to check different things (check for losw wires, check power supply to GPS antenna) the common theme was that my GPS unit or my antenna were "toast." However, then this guy that appeared to really know his stuff told me that what I need to do is download Lowrance GPS updates to my computer, and then, as long as I have a compatible compartment on my PC, transfer those updates from my PC to my Vancouver Islans mapping card/chip. He told me that this has been a common problem lately because WAAS satellites have been re-positioned, and my GPS can no longer find them. Does this make any sense to you. I have a very big fishing trip coming up soon, and would love to have this issue resolved. Thanks!
SOURCE: False fish readings
False fish readings are commonly caused by electrical interference such as alternator noise, and by air bubbles flowing across transducer.
For starters make sure your fishfinder is on an independent circuit and not on one powered by your ignition switch. In other words, you should be able to turn your fishfinder on, even though the engine is turned off. Ideally the fishfinder should be wired directly to the battery with an in line fuse.
Try running the boat at a speed slightly higher than trolling speed, then kill the engine, as the boat slows down to trolling speed do you still see false echos? If yes then the problem probably lies with how the transducer is mounted, or where it is located on the hull.
If you don't see the false echos when the engine is off, it may be necessary to reroute the transducer cable to keep it away from the boat's ignition wires. You can get transducer extension cables if necessary. Also there are filters that you can buy that suppress alternator noise buy attaching between the battery and the engine.
Another common cause of false echos from electrical interference is a transducer cable that has been cut and spliced.
I hope this information helps. Please reply if you have any questions about my response.
Posted on Feb 26, 2008
To get the updates, start with a blank card. The first time you use it you will plug it into the card reader. It may ask you to format here. If so click "OK". If not: Go to "My Computer" - it will show up there as a storage device. Right click and select format. It will in effect "erase" the card and "prep" it for further use.
Follow the prompts. When done you should be able to go to the site you wish to download from and when you click on the file it will ask if you want to save it. "Yes" to your "Desktop". Once done you can open "my computer" - double click on the card reader. It will open with nothing in it. Reduce the screen pic for the reader so you can also see your desktop. Put cursor on desktop file - Right click and hold the button down while you drag the file to the card reader file and let go of the button. Click "Copy Here". Now you should be able to take the card and insert it into the display to run the actual update.
Posted on May 08, 2010
Call customer service with the unit plugged in to the cradle. They can walk you through some updates and if necessary reformat the unit. If that doesn't work and it's out of warranty then you're screwed. They have a software glitch and if reformatting doesn't work and it's out of warranty then they suggest you throw the unit away and buy another. Trust me, I won't buy another TomTom.
Posted on Aug 31, 2010
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