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Assuming you are interested in the latest Map update, try contacting Panapacific, Although I have not purchased this product, they say they have the iWAY500c and iWAY600c Navteq Map Update Q1-10 v1.7 listed as Part Number: PACCARQ110
Although listed on their website, the product is currently unavailable for purchase online. Contact their customer service department at 1-800-726-2636.
I HAD THE SAME PROBLEM AFTER I DOWNLOADED THE LATEST UPDATE. I RELOADED IT AND NOW IT SEEMS TO WORK OK. GO TO THE LOWRANCE WEB SITE AND THEN TO DOWNLOADS. LOOK FOR THE UPDATE FOR YOUR GPS AND FOLLOW THE INSTRUCTIONS. GOODLUCK
Unfortunately Lowrance is no longer repairing the iWay 500c model due to lack of parts. You may try calling them at (800) 324-1356 and ask if i's repairable. They may offer you an upgrade to the newer iWay 600c for a reasonable price. Well it's cheaper than a new iWay anyway...
Unfortunately there are no parts or repair manuals available outside Lowrance for any of their models.
Unfortunately, the 500c is obsolete now and Lorance cannot repair the LCD screens anymore. Your only option may be to call Lowrance at (800) 324-1356 ad try to get an uprade to the newer iWay 600c. It's far from free, but less than you could buy a new unit for.
My iway 500c kinda had the same problem. At first while driving, the screen would go from 3d to always north to always up and be switching screens 3 to 4 times a second. It would finally go back to normal. After about a month of this the touch screen would work intermittently. It finally quit working completely on a trip to Texas. When I got home I called Lowrance and the said they would replace it for $350. I already spent over $600 for it. I took the thing apart and found the grounding screw to the touch screen was really loose. I tightened it and now its working again for now. I am not happy with Lowrance support.