What you see: a number labeled "age", "AoD" or "diff age" goes up past a few seconds, and you drop from FixThe best RTK status. The receiver has finished its math and your position is good to a couple of centimeters.Full definition to FloatA middle RTK status. Corrections are coming in but the math isn't finished, so you're only good to about a foot.Full definition or SingleNo corrections at all. Your position could be off by several meters.Full definition.
What it means
Age of CorrectionsLive info from a base station about how far off the satellite signals are, so your rover can cancel out the error.Full definition is how old the latest correction is when your RoverThe receiver that moves around the job, like a survey pole or a drone. It uses the base's corrections to find its exact spot.Full definition uses it. Emlid's docs say it is normally 1 to 2 seconds for RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.Full definition. When it climbs, new corrections aren't arriving on time. Old corrections no longer match what the satellites are doing, so the rover can't hold a fix.
Fix it
- Check cell signal. Weak signal is the usual cause. Move to higher ground, or try a hotspot on a different carrier.
- Check the hotspot or SIM data plan. Some plans slow down after a limit.
- Close other apps using data on the same phone or controller.
- Try another Mount pointOne specific correction stream on a caster, like one channel on a radio. Each one comes from a certain station or network setup.Full definition or ask the operator if the CasterThe internet server that hands out correction streams. Your rover logs in to it, like tuning into a radio station.Full definition is having trouble.
- Plan a backup. Record raw data so you can use PPK with NOAA CORS if the link keeps dropping.
Related: stuck in FLOAT · no-fix checklist