Or maybe I never knew; I get the heading in degrees and nm (#) between each waypoint, but what are the top two numbers?For example 7000 & *3300 between STOIC and DIXXIE?Thanks in advance for re-educating me, LOL... :(

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I believe the top one is the MEA, Minimum Enroute Altitude. However, I'm not sure what the bottom one is.

http://www.langleyflyingschool.com/Pages/I...Navigation.htmlMOCA and MEAMOCA (Minimum Obstruction Clearance Altitudes) is marked with an asterisk, MEA (Minimum En Route Altitudes) lacks an asterisk.see link for more Jon

Very interesting. I had idea about the MEA and that was my guess as well, but the asterick number stumped me. I wonder why they felt the need to create another acronym (MOCA) when the idea seems very near the term Mimiumum Safe Altitude (MSA) found on most charts?

MOCA only protects you from terrain within 22nm of the navaid. Which brings me to the next question...why have a MOCA on an RNAV leg? Both MOCA and MEA refer to navigation signal availability, so wouldn't the terms need to be re-defined on RNAV legs?Paul

good question, it does say on the link I provided that each intersection should include it's relationship to neighboring navaids radial/dme or bearing on LE charts, (Al's chart above is I assume not a LE chart). So I assume it is not just enroute navaids in VOR-VOR legs but is also referring to offroute navaids that define intersectionsJon

Here is the official FAA guide to Instrument Procedures: http://www.faa.gov/library/manuals/aviatio...dures_handbook/There is a huge amount of fascinating stuff in there, including all of the charts that you must use. There are a lot of other free FAA guides on that site as well.

Or maybe I never knew; I get the heading in degrees and nm (#) between each waypoint, but what are the top two numbers?For example 7000 & *3300 between STOIC and DIXXIE?Thanks in advance for re-educating me, LOL... :(

i am not sure but i think they are altitude limitsthe top one probeabily is the maximum altitude for that leg, and the bottom one is the minimum altitudebut i am not sure

The diagram above was a crop of the STOIC2 DP from Washington Dullas Intl (KIAD): http://flightaware.com/resources/airport/K...TOIC+TWO+(RNAV)What confused me a bit about the top number is this particualar DP calls for a 'expect crossing restriction' of 10K at RAISN (4 waypoints) down-range. I understand the DP is to route southbound traffic out and around the Washington and DCA airspace, but why is it so low for the first 23nm (7K-min at STOIC -> 10K crossing at RAISN)? Direct input into the FMC had me crossing RAISN at FL21 before entering the restriction at RAISN.@ Indyrocks, thanks for the FAA guides link above. Good info indeed....

What confused me a bit about the top number is this particualar DP calls for a 'expect crossing restriction' of 10K at RAISN (4 waypoints) down-range

Al: I can only guess, but if you look at the sidstars for Reagan, Andrews and Baltimore I expect you will find the answer to the altitude restrictions on this DP. A big chunk of airspace in the middle of all these airports is restricted, so there is some unusual routing and altitude restrictions going into and out of these airports to get around that constraint.

Ah, I didn't think to check other nearby procedures. Thanks Dan, that makes sense...