It's most likely the pilot departed vgt airport off runway 7 rather than runway 25 as stated in the report. After departing the reporter said he made a right turn to a heading of 200 degrees and climbed to 3000 ft. Using his DME, he believed he was remaining clear of the las class B airspace.

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Attributes
ACN	409830
Time
Date	199807
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : las airport : vgt
State Reference	NV
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las tower : vgt
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff climbout : intermediate altitude cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 26 flight time total : 4500 flight time type : 2500
ASRS Report	409830
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I took off from vgt after receiving a las squawk code and frequency from clearance delivery. After taking off from runway 25, I turned right to a 200 degree heading and climbed to 3000 ft. Vgt tower approved my frequency change requested and I called las approach. Las told me I was in radar contact but did not clear me into class B as I was expecting. When my DME showed 6.2 NM from las, I started a right turn since the class B floor drops to the surface at 6 NM. As I moved my finger to the microphone button to request class B clearance, approach told me I was in class B. I acknowledged, continued my turn, checked my DME which showed 6.1 and I doublechked my chart. I told approach that I was showing that class B floor was 4500 ft where I was. He responded that I was in the area where class B floor is at the surface. I apologized and flew out to DME 7.5 and flew a DME arc until receiving a class B clearance. Later I checked my DME against known ground sources and it appeared to be accurate. I don't know why the position discrepancies between my navigation equipment and TRACON's radar.

Original NASA ASRS Text

Title: IT'S MOST LIKELY THE PLT DEPARTED VGT ARPT OFF RWY 7 RATHER THAN RWY 25 AS STATED IN THE RPT. AFTER DEPARTING THE RPTR SAID HE MADE A R TURN TO A HDG OF 200 DEGS AND CLBED TO 3000 FT. USING HIS DME, HE BELIEVED HE WAS REMAINING CLR OF THE LAS CLASS B AIRSPACE.

Narrative: I TOOK OFF FROM VGT AFTER RECEIVING A LAS SQUAWK CODE AND FREQ FROM CLRNC DELIVERY. AFTER TAKING OFF FROM RWY 25, I TURNED R TO A 200 DEG HDG AND CLBED TO 3000 FT. VGT TWR APPROVED MY FREQ CHANGE REQUESTED AND I CALLED LAS APCH. LAS TOLD ME I WAS IN RADAR CONTACT BUT DID NOT CLR ME INTO CLASS B AS I WAS EXPECTING. WHEN MY DME SHOWED 6.2 NM FROM LAS, I STARTED A R TURN SINCE THE CLASS B FLOOR DROPS TO THE SURFACE AT 6 NM. AS I MOVED MY FINGER TO THE MIKE BUTTON TO REQUEST CLASS B CLRNC, APCH TOLD ME I WAS IN CLASS B. I ACKNOWLEDGED, CONTINUED MY TURN, CHKED MY DME WHICH SHOWED 6.1 AND I DOUBLECHKED MY CHART. I TOLD APCH THAT I WAS SHOWING THAT CLASS B FLOOR WAS 4500 FT WHERE I WAS. HE RESPONDED THAT I WAS IN THE AREA WHERE CLASS B FLOOR IS AT THE SURFACE. I APOLOGIZED AND FLEW OUT TO DME 7.5 AND FLEW A DME ARC UNTIL RECEIVING A CLASS B CLRNC. LATER I CHKED MY DME AGAINST KNOWN GND SOURCES AND IT APPEARED TO BE ACCURATE. I DON'T KNOW WHY THE POS DISCREPANCIES BTWN MY NAV EQUIP AND TRACON'S RADAR.

Data retrieved from NASA's ASRS site as of July 2007 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.