Hello, Been reading this thread with a lot of interest! even though the thread is aging it goes to show I for one have found some information. I have been having the same exact problem with my GPS receiver, I have a SinoSmart ST-707 which was made in China. It came with an igo Primo 2.4 maps card that has worked flawlessly. I recently bought a newer igo maps card version 18.104.22.168885, Jan 2016.
when I loaded it into the GPS receiver it showed my location as in London but I'm not in London I'm almost 90 miles from London!! it also informed me the GPS receiver wasn't switched on but gave the option to enable it which I did. now when ever the GPS map is turned on it says "Auto detecting GPS Receiver" I could leave it al day it wouldn't find anything! I know my Receiver is working good as my older Maps card always works.
I've taken note that deleting the "save" folder may help but I'm unable to do this as I don't have the means of a winCE computer! is there any other way of deleting the folder within the receiver? or how do I turn the GPS receiver off again since the receiver is working as it should be.