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navman f10? If so, check the DVD that came with your unit as they may be on there (if so, call up navman and PAY for the licence code) as they won't work otherwise. If it is not on the DVD (definitely the case with the s-series) then you can purchase them off navman's aussie website - check it out though as it may be cheaper to purchase from navman UK's website (was the case with maps for the f20).
It is likely your battery is depleted or it can also be an unlikely flaw in the firmware.
To eliminate the firmware flaw, restore (flash) the entire firmware using a downloaded version from the Navman.com site or an upgrade of the OS and or GPS app which will likely include an entirely new firmware.
Since your battery isn't retaining a charge, this operation should be performed from a PC demonstrated to provide power to the PiN 570 and or a reliable power strip on a UPS if you're using the split AC/USB cable.
A device subjected to a power interruption during a firmware flash can become permanently ruined or cost ineffective to recover.
Most GPS systems require a first time boot-up where they scan all registered satellites to determine where in the world they are and what satellites to concentrate their navigational efforts on. Try charging the GPS up entirely, and then doing a hard reset of the system (either by navigating to the hard reset in software or by pressing the tiny reset button usually located on GPS units), and then taking the system out under the open sky and letting it run for half an hour or so, making sure it is running in navigation mode (as opposed to setup or media mode). Once it locks properly onto a small subset of satellites, it should not have much difficulty.
If you continue having problems, check to be certain you are running the latest software on the device which can make a big difference. The latest software for the 520 is here: http://www.navman.com/Navman/Templates/standardcontent____4407.aspx
It is not easy to say what the problem can be. In my opinion you should contact the producer of this GPS receiver and ask them what the problem is. If this has been tested the producer must be able to help the users.