I was browsing reddit on my Android tablet and had opened a number of tabs in the background in Chrome; I noticed that one of them had downloaded an .apk file (333s111.apk, the only other reference to which is here). I didn't run the .apk and deleted it straight away via the File Manager. I didn't see any evidence that it installed itself, or did anything malicious, and I don't have that option that allows non-Market apps to install themselves turned on. [more inside]
I used to have an app on my Nokia E71 that would allow me to set waypoints and then provide a distance and bearing back to that position using the phone's built-in GPS. You could store thousands of GPS waypoints, either by using your current location or by entering long-lat; and organise waypoints into groups. There was no need for any data access. Does something like this exist on Android (HTC Desire)? What I'm not looking for is an offline SatNav program like CoPilot or MobileNavigator.