Check your current software version. Power on the unit, then I believe its Menu – Menu – System Information. Its on pg. 183 of the 520 manual. The latest version for the 520 and the 522 is version 2.5.0. Its only 8.6 MB so it should fit on your existing SD card. I updated my 520 recently from an older version (1.6.0???) and the difference in features and image quality is unbelievable. I wont waste my time upgrading my in-dash 520. With a Hotmaps Gold (South) chip upgrade its got all the features Ill ever need for an in-dash unit. Im spending my coin on an HDS 8 with Ram Mount (D-111U-C) for the front.Last edited by Guest on October 23rd, 2012, 9:56 pm, edited 1 time in total.