What is RAIM | Receiver Autonomous Monitoring | How GPS Works

RAIM uses more than the minimum required number of satellites to perform checks on the position calculated, identifying faults in satellites and ensuring integrity of position reporting.
Check out IFR ground school at flight-insight.com/ifr

[@JustSayN2O]

My CFII gives me oral exam practice questions after each training flight. Today's was: "explain RAIM". I choked. So I went home and reviewed this video several times. How is this (below) 30-second summary of FlightInsight's phenomenal 4+ minute presentation? -- Receiver Autonomous Integrity Monitoring allows your airplane's GPS navigator to confirm that it's receiving a sufficient number of valid satellite signals to correctly determine its location and altitude, while rejecting any faulty signals from malfunctioning satellites. This assurance of positional integrity requires at least five functioning satellites in view. Various websites and applications confirm RAIM availability for our intended flight path and time. If RAIM is, or becomes unavailable, then GPS cannot be used for navigation. --

[@Archonch]

I just can't believe the quality of this channel's videos. Everything is perfectly clear. Simplified but not overly simplified.

[@itsducky3248]

I love your videos! I'm studying for my instrument checkride and these videos make it so easy to review.

[@johnopalko5223]

And this is probably the best argument in favor of WAAS. If you have a WAAS capable receiver you don't have to do RAIM predictions. (You probably should still do them, though, just in case.)

[@jameneto]

Thank you! I really appreciate all this knowledge you share with us. Very interesting!

[@_Breakdown]

GPS system - - 0:27 - - requires reception of signals from a minimum of 4 satellites. RAIM (Receiver Autonomous Integrity Monitoring) - - 1:56 - - requires a minimum of 5 satellites. (Note - - separate video - - ADS-B requires a clear line of sight of 288 miles)

[@thomasyuhas]

Dan- I have been digging into GNSS, GPS, SBAS, WAAS, RNP and PBN. Your newest video was very timely. Now you need to sort out the alphabet soup of the aforementioned acronyms!! I always learn something from your work- realizing how much I don't know! Happy New Year!!

[@flightinsight9111]

GNSS is a general term for satellite navigation systems like GPS (GLONAS and Gailileo) are others. SBAS is a general term for augmentation which WAAS is one of. RNP deals with the error tolerance of equipment (0.3 nm is required for a general GA GPS approach). PBN deals more generally with equipment and also operator requirements like crew training etc. there, sorted you out without a vid lol! Definitely merits a deeper dive at some point though. Happy new year

[@healerf18]

@@flightinsight9111 Like OP I've been digging in as well, but in one sentence you've helped make sense of it all. Thanks!

[@jakew9887]

Great presentation. Thanks

[@faaacademyairportcertifica5155]

IN GPS RADAR THERE NEEDS TO BE 4 DIFFERENT SATTELIHTS AT A TIME?

[@faaacademyairportcertifica5155]

THE LEGACY CAN CALUCULATE IF RAIM IS NEEDED? IT CAN BE USED IN IFR BUT IF RAIM IS LOST THEN THEN APPROACH HAS TO BE CHANGED TO RNAV OR OTHER?

[@AllegeK]

Is the Enroute-2nm, Terminal-1nm, App-0.3 to 350ft assured when we have RAIM availability? not a WAAS?

[@granthardegree126]

I’m fairly certain that’s correct, the RNP is based off of RAIM availability, which is why we have to change means of navigation if RAIM is lost as we lose the certainty of gps accuracy. WAAS enhances our gps allowing even more accuracy as well as the ability to shoot lpv and lp+v approaches. Correct me if I’m wrong though 😅

[@faaacademyairportcertifica5155]

IF ONE OF THE SATTELITES ARE MISAIMED THEN A FIFTH SATTELIGHT IS NEEDED? A FALSE POSITION IS GIVEN?

[@JustSayN2O]

While preparing for my instrument oral exam, I came up with this question. Hopefully somebody can answer: If while flying an approach in IMC to an airport having only RNAV approaches, there is suddenly a RAIM flag during the approach, how do you fly the missed approach, since it too requires GPS navigation?

[@Alex10121]

Depends on how long the RAIM warning is displayed for. There is a greater GPS accuracy requirement required for the approach segment, when compared to the missed approach, so initiating a climb could potentially remove the RAIM warning.

[@JustSayN2O]

Yesterday I asked my CFII and his response was: Initiate the climb, notify ATC of the RAIM failure, and they will give you instructions, presumably vectors.

[@spacecoyote6646]

Hey Ryan Reynolds take your mint mobile and shove off. Matt Damon in the crypto thing ruined celebrity endorsements forever