This problem seems to be caused by a missing file on the OMATA One.
It is likely that the file MGA.DAT is missing from a folder on your device called GPS.
If you connect your OMATA One over USB (turn the bezel to CONNECT then after you turn it to CONNECT, attach it to your computer over USB) and, in your system's file browser, you do not see the file MGA.DAT then this is likely the problem.
If the file MGA.DAT does not exist, you can download it here: MGA.DAT
It is important that you ensure the file is not corrupted or renamed during the download, which can happen with some browsers, or while copying or moving the file. You must place the file MGA.DAT into the directory GPS on your OMATA One.
This file is an almanac of GPS satellites and is updated regularly. For best performance, and fastest time to get a GPS fix with your OMATA One, you should ensure that this file is updated on your OMATA One via the App. (You can of course update it manually as described above, but this is obviously far less convenient — but entirely possible.)
If you have any questions, please contact firstname.lastname@example.org