Question about Garmin GPS 48 GPS Receiver

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Garmin 45 I got a garmin 45, it been store a year. now it see satellites's position but it's not receiving infos from them please help

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  • boochard Jan 02, 2009

    I have a Garmin 45 that has been in storage for a number of years. Now it just see's satellites, but does not receive a signal form them, and just continues to "search the sky".



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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. 

Posted on Oct 29, 2007

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  • Paul Hyde
    Paul Hyde Oct 29, 2007

    Correction: Be sure to hit "enter" after you change the coordinates on the position screen.

  • luciano_vett Jul 04, 2011

    Hi, i've power off my Garmin 45 last year and take off the battery . Now i've try to re-use the GPS ma it doesn't acquire the satellite although i've insert the coordinate. May you help me ?
    Thanks and best regards

  • Paul Hyde
    Paul Hyde Jul 04, 2011

    If the batteries have been out for over a year, the GPS has to do a "cold start", which means it has to search the sky for each satellite one at a time. It can take that particular model up to an hour to complete a cold start. If the GPS is doing a cold start it should remain stationary until it acquires.

    Try placing the GPS outside in an open area and leave it on with a fresh set of batteries.Check the satellite status screen to see if it is receiving any satellites. If it does not show any satellites on the bar graph there may be something wrong with the antenna. If you get some satellites, but the GPS doesn't acquire after an hour or so, you may need to update the almanac. There have been some changes made to the satellites since that model was manufactured and it may not recognize the new satellite data. An almanac update can be done by downloading form a PC or by interfacing with another Garmin GPS.

    For what it's worth that technology is so old, and the new models are so much more accurate, easier to use, and have better battery life. You may be better off buying a new one. Even the least expensive models will be much better than what you have now.



There's a function in the menus somewhere that you have to check, that does something that must be necessary when changing location in the order of 100's of kilometres since it was last turned off. The default algorithm must assume you are not far from where you last turned it off. You have to prompt it to 're-set' itself. Look for the keywords in the menus "NEW LOCATION". Set it and you'll get a position.

Posted on Sep 26, 2008


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"Upload ...Not Present" message. Nothing else on the screen. I replaced the internal battery last spring used it all summer. Have just checked internal and external batteries and all are fresh 3v internal and new AA four batteries. Upon startup the screen says "Upload" "Not Present" and there is no menu. I have tried hitting Page and Menu, etc. nothing happens. I tried leaving it out and on for 3 hours to see if it would find itself and satellites. I tried connecting to the computer and uploading the internal program the port was not found. Tried this a number of times and a number of ways. I have tried leaving it on to search for 3 hours and have tried to connect to my computer to reinstall the software but that does not work. The internal battery was replaced with a new one last year. I have fresh batteries in the unit. What is the problem? How do I fix it? Thank you. I love this unit and would like to keep it going. I have fixed two others for friends who needed the internal battery fixed. They use it as a backup. I have tried the Auto Locate procedure about 3 times. I have also tried clearing by holding the PAGE + Power. Then tried autolocate. Message "Upload... Not Present" still remains. Also have tried clearing by holding the MARK + Power. Then tried autolocate. Message "Upload... Not Present" still remains. Now I am wondering if this message has to do with an interrupted connection with EasyGPS from last winter. I was uploading waypoints, and thought it had completed and may have turned off and disconnected the plug before an operation was completed in saving waypoints off the Garmin 48. I do not know this for a fact, but that was the last operation I recall doing last fall, before starting the GPS up again on the boat this spring. I have also tried to connect the unit to Easy GPS via the serial port, thinking perhaps it would complete whatever it is trying to do. I have tried uploading routes and downloading routes via EasyGPS send and recieve and it does not seem to work. I wonder now if the interface setting has been reset, by my pressing PAGE+power and Mark + Power earlier. I would not mind that if the menus came up properly, but that is not happening. Is there some other way to kick it out of this mode? I turn it on and there is the message "Upload...Not present" and none of the menu buttons work to get it into the normal startup screen mode..... I've tried Quit, Page, Enter, Goto, Mark, Power (off and on), and none of the get the computer out of this mode and back into the normal menus for startup. I've removed the antennae and checked all the contacts and that seems fine, and reinstalled. Is there some small reboot button inside that I can jumper? I have tried taking the internal battery out and letting it sit for three days and it still does the same thing. Any suggestions would be appreciated

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