Free Flight 2101
Just a warning to anyone with the Free Flight 2101 GPS.
We had a faulty antennae on one of our A109E's causing poor satellite reception. This GPS has a Dead Reckoning back-up which I think could kill. When the system loses its GPS fix it uses dead reckoning. The only way the pilot knows this is happening is if he sees the symbol DR on the EFIS, which is easily missed.
Meanwhile the moving map carries on moving, and you think all is well. However errors start to magnify with any turns and soon you are not where you think you are…