This has bitten me a few times. Sometimes I make a mistake entering the FoV value, like entering 25 when I meant to enter 2.5. This causes SGP to go off and start downloading a 25 degree tile! AFAICT the only way to stop it is to exit SGP. It would be great if the F&M Wiz gave me the opportunity to cancel the download without having to exit SGP to do so.