B757 flight crew has a track and heading deviation during departure from mia.

Attributes
ACN	722279
Time
Date	200612
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : winco
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	722279
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were assigned the winco 1 RNAV departure out of my mia. Tower assigned a heading of 090 degrees after takeoff; which we thought was a heading to intercept the RNAV departure track. When we reached senoy we turned nwbound on the RNAV departure but departure control informed us that we were to fly the assigned heading until they cleared us onto the departure. The ATIS indicated that RNAV departure will be assigned a heading. I believed that the whole purpose to the RNAV departure is for us to fly the track. This is the emphasis at dfw anyway. I think there is some confusion that needs to be cleared up from the mia tower and departure controllers.

Original NASA ASRS Text

Title: B757 FLT CREW HAS A TRACK AND HDG DEV DURING DEP FROM MIA.

Narrative: WE WERE ASSIGNED THE WINCO 1 RNAV DEP OUT OF MY MIA. TWR ASSIGNED A HDG OF 090 DEGS AFTER TKOF; WHICH WE THOUGHT WAS A HDG TO INTERCEPT THE RNAV DEP TRACK. WHEN WE REACHED SENOY WE TURNED NWBOUND ON THE RNAV DEP BUT DEP CTL INFORMED US THAT WE WERE TO FLY THE ASSIGNED HDG UNTIL THEY CLRED US ONTO THE DEP. THE ATIS INDICATED THAT RNAV DEP WILL BE ASSIGNED A HDG. I BELIEVED THAT THE WHOLE PURPOSE TO THE RNAV DEP IS FOR US TO FLY THE TRACK. THIS IS THE EMPHASIS AT DFW ANYWAY. I THINK THERE IS SOME CONFUSION THAT NEEDS TO BE CLRED UP FROM THE MIA TWR AND DEP CTLRS.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.