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VMG?

5/30/2012 2:07 PM

Tim Myers

Joined: 12/8/2011

Posts: 286

VMG?

OK, I must have missed something!!!

What is Velocity Made Good?

5/30/2012 2:23 PM

Shane

Joined: 4/21/2010

Posts: 1709

Re: VMG?

Here is a list of the Instruments with a brief description for the benefit of any others. I highlighted the VMG for easy reference.

Instrument	Full Instrument Name	Description
Course Tape	Course Tape	Active compass tape and ball. The needle indicates the current track and the ball represents the target waypoint.
Gnd Speed	Speed	The current speed of the aircraft relative to the ground in KTS, MPH or KPH. (Note: This is not Airspeed.)
Track	Track	Indicates the current path or track over the surface of the Earth directly below an aircraft. True or Magnetic. (This is not heading, and will likely vary the aircrafts physical heading on account of winds.)
Altitude	Altitude	GPS altitude measures the current distance from your position to estimated Sea Level. (This is not the same at Pressure Altitude and will likely vary from your pressure adjusted Altimeter.)
Bearing	Bearing	The compass direction needed to fly in order to reach the next target waypoint.
Turn	Turn	The degrees of turn (Left or Right) needed to fly to the next target waypoint.
XTE	Cross-Track Error	The distance the aircraft is off course to one side of the course line. (A negative XTE value is left of centerline and positive XTE value is right of centerline)
VMG	Velocity Made Good	The current velocity in the direction of the next waypoint. KTS, MPH or KPH
ETE: Final	Estimated-Time-Enroute to Final	The estimated time remaining to the Final destination at your current speed or VMG.
Flt Duration	Flight Duration	Elapsed Flight Time calculated once aircraft exceeds 20 knots.
Time	Current Time	Local Time for the set Time Zone. GPS Signal required. (Note: Time Zone changes not corrected at this time.)
Dist: Final	Distance to Final	Distance from the current position to the Final Destination. (Can be in Knots, Miles, Kilometers)
ETE: wpoint	Estimated-Time-Enroute to Next Waypoint	The estimated time remaining to the Next Waypoint at your current speed or VMG.
Dist: wpoint	Distance to Next Waypoint	Distance from current position to the Next Waypoint. (Can be in Knots, Miles, Kilometers)
VST (fpm)	Vertical Speed To Target (VST)	Target rate of climb or descent needed to arrive at Pattern Altitude for the next airport in the flight plan, or the final destination. Instrument appears when the VST reaches a defined rate of descent.
Vert. Speed	Vertical Speed	Calculated rate of climb or descent in feet per minute (fpm).
Final	Final Destination Name	The Name, Identifier or Lat/Long of the Final Destination.
Waypoint	Target Waypoint Name	The Name, Identifier or Lat/Long of the next target waypoint.
ETA: wpoint	Estimated-Time-of-Arrival to Next Waypoint	The estimated time of arrival at the Next Waypoint based on the current Speed or VMG.
ETA: Final	Estimated-Time-of-Arrival to Final	The estimated time of arrival at the Final Destination based on the current Speed or VMG.
Vertical Profile	Vertical Profile	A moving profile view of your current position relative to the terrain, obstructions and airspaces ahead. (Tip: Touch this instrument for a full page profile view.)

Shane Woodson
Vice President | Adventure Pilot LLC.

5/31/2012 2:32 PM

Tim Myers

Joined: 12/8/2011

Posts: 286

Re: VMG?

Thanks Shane, I looked it up on the web and figured it out but the list is will be handy.

Tim

5/31/2012 4:37 PM

Shane

Joined: 4/21/2010

Posts: 1709

Re: VMG?

I thought it might help some others out, just in case.

The VMG, can also be further explaned by this scenario. If you fly a perfect circle around your waypoint, you would have a 0 VMG. Now if you fly a spiral, gradually getting closer to your waypoint, you would have a VMG value somewhere between 0 and your actual ground speed. Finally, if you are flying directly at, (bearing and track match), you shoud have a VMG that matches your ground speed.

Kinda long, but Ed and I were talking about this and I thought it would be a good posting. Have a great day and fly safe.

Shane Woodson
Vice President | Adventure Pilot LLC.

6/27/2012 10:47 AM

88N

Joined: 10/10/2010

Posts: 22

Re: VMG?

Just a nit picky comment: Dist: wpoint and Dist: Final should read NM instead of Knots:

Distance from the current position to the Final Destination. (Can be in Knots, Miles, Kilometers)

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Distance from the current position to the Final Destination. (Can be in Knots, Miles, Kilometers)

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