Technically 12.5 minutes :). Here's a bit of fun (to me) info about the GPS constellations and the wild speed of it: - data transmitted at 50 bits/s - data fr

Technically 12.5 minutes :). Here's a bit of fun (to me) info about the GPS constellations and the wild speed of it: - data transmitted at 50 bits/s - data frames are 1500 bits long, divided into 5 subframes - Subframes 1-3 are satellite-specific and subframe 3 contains the high-precision orbit information for the sat you're receiving from. Subframes 4 and 5 contain the almanac that gives you a list of coarse orbit info for the entire constellation. - The almanac consists of 25 pages of data. Each sequential frame has one page of the almanac. 30 second frames * 25 pages = 12.5 minutes to download the entire almanac once you have a lock on a given satellite. All of the satellites broadcast the almanac at the same time, but they're time synchronized so all of them are broadcasting page 1 at the same time.