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Battery is too low to recive a signal The wrong port is selected in the settings The antenna is diosconnected or broken The SIIRF chip is damaged ( connecting to DC car outlet when starting engine) Battery needs replacing poor view of the sky Too far back from windscreen Too much window tint
First though Take off the faceplate ( using a credit card or similar) locate the reset hole and reset it to factory. Your saved data will be lost ( previous trips data and any skins applied) it may recover and reconnect for you. But charge the battery properly on an AC charger or via the USB.
Does your GPS have a good view of the sky? i.e. not mounted low on the dash of your car.
it really only needs to find 3 satellites to work but it might take a while to lock on if reception is low.
When you say every time you turn it on. I assume that you don't go days without turning it on. A GPS stores information about satellites and their orbits across the sky and keeps it for about 6 days. The download process of this information is fairly slow. If you run it most days the information gets updated while the gps is running so you tend not to notice.
Piece of cake. Remove screws from back of device. Separate the housing and carefully lift up circuit card off of pins. There is a battery holder underneath. Simply remove wafer battery and replace with like model battery. Put back together and you're off.
Sounds like the memory battery ran low. Did you get a "Memory battery low" warning message when you switched it on? If so then that confirms it, and I'm afraid your waypoints are lost.
As for the memory battery it will take on some charge if you just put in fresh AA batteries. How much charge depends on the age of the GPS, mine is over 10 years old and the memory cell is pretty much dead now.
Grmin may or may not replace the cell for you depeniding on the age of the device. If you want to do it yourself it's a very fidldy job requiring some expertise with a fine pointied solderign iron. The case is held together with solicone sealant aroung the joining edges - there are no plastic catches - one piece of the case has a sort of trough around the edge that the other piece/side slots into and the trough was fileld with silicone sealant and the two pieces sandwiched together. It's not a very strong glue though so it can be prised apart with a fine knife and patience.
It is probably one of the following:
In 1999 the GPS satellites were reset and the new almanac data had to be loaded into the GPS 45 for it to continue to work. It was not uncommon for that model to quicly kill a set of batteries when it is having difficulty acquiring, which would cause it to shut down in order to save the batteries for its internal memory.
I just did a quick search of the Garmin website and it appears they no longer support that model. If you go to their support page and send a request for a software update they can probably e mail it to you. The update is free but to down load it, you need a PC interface cable (RS232 serial port connector) Part Number: 010-10141-00 Suggested Retail Price: $ 38.09.
To rule this one out, borrow an antenna from another Garmin 45 or Garmin 48, or plug the unit into an external antenna and see if the unit still shuts down. The drawback to this method is that you can buy a new GPS that is superior to the one you have for about the same price as an external antenna.
If your batteries are low, the unit will automatically shut off to protect its internal memory. I tried a lot of different batteries in my 45 and I found that Eveready alkaline batteries worked best. Rechargeable nicad batteries don't work very well because they fool the battery meter. Newer models have a setting to specify that you are using rechargeable batteries.
Ultimately the best advice I can give you is buy a new GPS. For less than $150 you can buy a new model that is more accurate, more reliable, stores more waypoints, has a better display, is easier to use, and gives you more valuable information.
If you know your coordinates, enter them on the position screen.
Use the track pad to highlight the coordinates on the position screen. Press "enter". Use the track pad to change the digits to match your current position. Place the GPS where it has a clear view of the sky and wait. If you have a power cord, plug it in as it may take as much as half an hour. Do not move the GPS while it is trying to acquire. The antenna should be vertical.
If the GPS still doesn't acquire, it may have lost the satellite almanac data, which has changed since that unit was manufactured. I could not find a software update on Garmin's website for that model, however, it is possible to transfer the almanac data from another garmin. Post a follow up message here and I can give you more instructions if needed.