Thread: About 37xx converted to 34xx satellites reception accuracy

Checking the option Cold Start (screen gps / height / cold start), I realized that the previously recommended procedure in this topic does not work, that is, select the option and restart the gps does not enable Cold Start. This option is very useful because it erases, probably, ephemerides, almanac and other information that are recorded in parts of protected memory of gps. To work effectively we must do the following: select the Cold Start option and then "Start Single" in the upper left corner of the screen. Note that the synchronization table is reset and restarted. Go back to the satellite screen quickly and check really the true reboot of satellites.

With regard of the "Predicted Eph" option (ephemeris predicted) what would it be? How Ephemerides are highly detailed information of orbits used by GPS to calculate the position of the satellites (not valid for more than 4 hours), I assume that enabling this option, the gps would be using Ephemerides data already stored to calculate the orbits of satellites. The Cold Start option is that would restart and would store the new Ephemerides information (and perhaps the almanac) sent by satellites (in hotfix files and, maybe in firmware too). To enable the "Eph Predicted" the procedure is the same as Cold Start. Thus we enabled the option can be observed in the table that the tuning of the satellites comes with Ephemerides, ie, are being used Eph data already stored in the GPS. Perhaps this option can be useful in places with difficult and/or low tuning satellites, but in practice does not seem to be useful in our case. When we enable the Cold Start option is observed in the table that gradually located and synchronized satellites and in sequence the Ephemerides data are received, ie, new data from eph, what really matter.

Finally, a recommendation to improve the "accuracy" that appears on the screen: as suggested by isg​ in previous post, delete the files in the folder System / GPS (arc.bin, bee.bin, mt.nvm). In satellites page we observe that restart of satellites, an apparent Cold Start, but the "accuracy" can go bad (happened to me). After satellites synchronization stabilized, make the procedure of Cold Start as described above and "accuracy" will improve immediately. Just not done yet comparative tests with the 3790 to see how much improved in relation to the original, or how long will last the improvement.

In short: I think always important to understand the reasons and above all, do not be afraid to expose doubt or unawareness, we are all learners, to varying degrees, including experts .. We are learning from each other .. Along this line who know clearly identify, or supposedly, the contents of files arc.bin, bee.bin and mt.nvm (hotfix files and..) would be giving a good collaboration.