ForeFlight GPS accuracy

nibake

Powder hound
I'm well familiar with how RAIM and WAAS work, and while doing my CFI renewal, I started to wonder how actual RAIM compares to the accuracy shown on ForeFlight.

In order to make the comparison I would need to know how the iPad/ForeFlight is calculating the accuracy and whether there is any integrity monitoring going on, regardless of actual approval. (For example, even a RAIM and/or WAAS capable panel mounted unit should not be IFR approved if antenna placement was not I/A/W AC 20-138B).
 

Flyinthrew

Well-Known Member
I have an iPad with a bluetooth GPS puck. I also fly an airplane that continuously displays my horizontal and vertical error. The jet's horizontal error is generally zero feet. The jet's vertical error hangs out in the 5-10 foot range. It does not have WAAS. When I'm nice and stable, the lat/longs match up incredibly closely (I can't remember to what digit, but it is in the decimal of seconds). When I'm making hard turns, it is pretty obvious that the updates on the iPad are lagging a few seconds simply based on the ground track being a bunch of straight lines between updates instead of curves.
 
I'm well familiar with how RAIM and WAAS work, and while doing my CFI renewal, I started to wonder how actual RAIM compares to the accuracy shown on ForeFlight.

In order to make the comparison I would need to know how the iPad/ForeFlight is calculating the accuracy and whether there is any integrity monitoring going on, regardless of actual approval. (For example, even a RAIM and/or WAAS capable panel mounted unit should not be IFR approved if antenna placement was not I/A/W AC 20-138B).
Don't use it if you're in the vicinity of Vlad. He's jimmy jacking it.
 

Lawman

Well-Known Member
What does everybody recommend as far as GPS pucks? Pairing off my phone is wholly inadequate for what I’m trying to do.
 

Lawman

Well-Known Member
I think these days for aviation most are skipping the pure GPS and using a combination GPS/ADSBin like Stratus or Scout.
I’m looking for minimum 10 hours battery life and usability both here and abroad.

Anybody has any ideas of what’s worked well for them, particular with the remote operation guys out in the bush I’m all ears.
 
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