Hi Todd,
Thanks for the reply. I looked in all three of the manuals, and read all of the same information that you provided - unfortunately, none of it answered my questions. The information I asked for is not contained in any of the manuals:
1) Position fix mode - GPS's can obtain a position fix in 3 dimensions (3D mode) or in 2 dimensions (horizontal 2D mode, which uses sea level as the fixed altitude). GPS receivers can be set up to do their position fixing calculations in 3D mode only, 2D mode only, or automatically switching between 3D and 2D depending on which satellites can be picked up. What I'm asking is how this device operates (which mode does it use?). It is not an API question, but related to the internal workings of the receiver (how your firmware is commanding the receiver). I would expect that whether in mobile mode or 'fixed position' mode, that the method used to calculate position would be the same.
2) My question had to do with when the receiver is locked to GPS time. The words 'lock' or 'locked' do not appear anywhere in the referenced document.
3) GPS locked, and "No GPS Time" - yes, I read all of that information, too. Am I to then imply that the receiver is locked when any other status is reported? This is obviously not the case. "No useable satellites" status, for instance, could be reported at any time. Is the GPS locked whenever I get this status? Most likely not. Other receivers I have used can lose/acquire locked status many times during the course of operation. I need to know when the receiver is locked, and when it is not.
4) "Satellites Available" property - Yes, I read this as well. It did not answer my question, and actually creates more confusion. I can have 9 satellites visible (reported by 6682), but be getting a "No Useable Satellites" status. If I disconnect the antenna, the number goes to 0, so apparently this is not a number that is calculated based on a known position and time of day, i.e. 'X number of satellites are within the field of view at this location at the current time'. Yet if I plug the antenna back in and locate it somewhere where it cannot possibly read the satellites, I still get the 9 satellites visible. So my question is, how exactly is this number being determined/updated? Why does it not go to zero when I obscure the antenna from the satellites?
I believe there is an interaction between the various reported GPS information/properties that is not documented. I find both the NI-Sync User Manual and API reference to be lacking in detail. I scoured all of the manuals you referenced for the answers I was seeking before I posted these questions (as I always do).
