I believe Frame is the time it took in milliseconds to update the screen.
HDOP is the horizontal dilution of precision, which is the horizontal accuracy of the GPS in metres.
Alt is altitude
“tram” has something to do with AOG’s tramline functionality.
Roll is the IMU roll angle if you had an IMU
FUZ would be the fusion of the IMU heading and the GPS heading (if you had an IMU).
GPS is the heading that is in the VTG messages from the GPS
IMU would show the IMU’s heading.
HDOP is a figure that describes how well the satellites are positioned in the sky compared to the receiver position. The receiver type affects the figure only in the sense how many satellite constellations the receiver supports.
EDIT: Your screenshot shows “Single” in the upper right-hand corner. That means you do not have RTK. At best you have DGPS, which is not accurate. Do you expect to have RTK? If not you might be able to turn on SBAS in U-Center, which will give you more accuracy. Obviously RTK is ideal.
Further Edit: If you have the latest firmware installed on your F9P, SBAS should be enabled and if you live in north America or Europe, it will use it automatically. Takes a long time to acquire, though. Took my bench F9P at least 10 minutes to lock on and get a DGPS fix. AgOpenGPS will say “DGPS” in the upper right-hand corner when you have WAAS (SBAS) acquired.
If you need to, you can update the firmware through u-center. I think you have to download the firmware from ublox’ web site and then upload it through u-center.