Recently I found the Satio really slow to get a GPS lock, in fact on occasion it would time out, despite having network assisted methods turned on. I began to think the handset was faulty, but I didn’t fancy doing a hard reset just to verify this.

However I found a magic cure, at least for my problem.

I went to the service menu (red twice, green once, red twice, green once, red twice) and then Service Tests. Go to GPS and then there is an option to Purge Assistance Data.

After purging the data, the GPS locked almost instantly! W00t!