Sounds like the aerial. There is a very fine wire in the center of the male aerial plug. If this is bent then you will have that problem. Aerials are hard to get, dealers say they are obsolete...update your model. Cheers, Peter
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It is an old unit, it has been discontinued, there are no software updates for it.
Technology has moved on with larger High Definition displays, colour and side imaging. Time to retire it and look at Humminbird. I have the 998 HD Si. That replaced a 798 before it. Lowrance have the Chirp equivalents if you want to stick with Lowrance.
With a normal GPS device, when you first switch it on, it needs some time to locate enough satelites. Most of the time it needs at least 5 satelites. Some time should be like minutes and not hours. After the GPS device fond enough satelites, it knows where it is and can when it is switched on again work faster. When you try to let the GPS search for satelites indoors, or without a free view to the sky, it is possible the receiver never can find satelites at all. I don't know if any test of the Lowrance iFINDER Hunt GPS was placed on the net, but that is where you can check how long it should take for the GPS to find enough satelites.
The TomTom device needs to tune in on three or more GPS satelites to find your position. On start, it scans the hemisphere for any satelites and ten minutes and more are not uncommon to establish fixes on them.
The solution is a data package you can download from TomTom servers via the Home software, "QuickGPSFix". It holds precomputed satelite positions for the next few days which speeds up locking to satelites to a few seconds from minutes. However, you need to update the package roughly once a week or the initial delay will pop up again.
10-15 minutes is normal. Did you take it outside? GPS doesn't work indoors. Try in an open field, no trees. Should lock in a few minutes. I always do the following: i key in the destination address at home, then put it under 'favourites". When i start driving, i put the unit in my car and look up the recently added favourite. The unit then has enough time to lock on to the satellites.