As Dave says, I think it has to do with RAIM (Receiver Autonomous Integrity Monitoring) sequencing when you have something entered in your flight plan page, such as a destination, and possibly an approach. Becomes more accurate/sensitive when you get closer to destination or on final approach to a runway. I believe that 1.2 would indicate you are on an enroute segment of your flight plan, as in your example. In Dave’s example of .3, I think that he is on a final segment of his flight plan, probably final approach. In both cases, 2 dots in the examples indicate 2 dots off course, but the distance off course depends on the phase of flight. RAIM ensures available satellite signals meet the integrity requirements for a given phase of flight. This is an IFR requirement for GPS navigation, and something you should check when conducting GPS IFR flights, including approaches. RAIM coverage can be checked on the ground before you take off. It has to do with satellite coverage. If you get a positive RAIM check, you should be good to go, but you should check your RAIM number before completing a GPS approach if it is one requiring it, such as an LPV approach.