C210 pilot violated bos class B airspace.

Attributes
ACN	414370
Time
Date	199809
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 6000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos tower : lzu
Operator	general aviation : personal
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C, 210D
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 30 flight time total : 580 flight time type : 280
ASRS Report	414370
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited penetrated airspace
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On sep/xa/98, I departed bvy (northeast of boston) to the north with the plan of flying north out from under class B airspace and climbing over it and proceeding southwest to new york. My primary navigation tool for this was an apollo precedus. I was climbing to the west with the intention of skirting the edge of class B like a DME arc. I was not in the class B. Suddenly I was in the class B, I referred to the LORAN and it confirmed I was in the class B about 1.5 mi. I went from cruise climb to a faster climb. I was not sure how I managed this error, until on my return trip. On return, I overflew bvy at 7800 ft and proceeded northeast and was watching everything. While watching the precedus map display, at several mi north of bvy, the class B ring disappeared! I never suspected that the precedus was unreliable in that fashion. What caused my violation: bad software and trusting GPS only when I had a LORAN also. Precedus software version 6.2. How to correct this: 1) watch both. I will. 2) forward this to apollo by email and phone. I will, and I will be a pest about it.

Original NASA ASRS Text

Title: C210 PLT VIOLATED BOS CLASS B AIRSPACE.

Narrative: ON SEP/XA/98, I DEPARTED BVY (NE OF BOSTON) TO THE N WITH THE PLAN OF FLYING N OUT FROM UNDER CLASS B AIRSPACE AND CLBING OVER IT AND PROCEEDING SW TO NEW YORK. MY PRIMARY NAV TOOL FOR THIS WAS AN APOLLO PRECEDUS. I WAS CLBING TO THE W WITH THE INTENTION OF SKIRTING THE EDGE OF CLASS B LIKE A DME ARC. I WAS NOT IN THE CLASS B. SUDDENLY I WAS IN THE CLASS B, I REFERRED TO THE LORAN AND IT CONFIRMED I WAS IN THE CLASS B ABOUT 1.5 MI. I WENT FROM CRUISE CLB TO A FASTER CLB. I WAS NOT SURE HOW I MANAGED THIS ERROR, UNTIL ON MY RETURN TRIP. ON RETURN, I OVERFLEW BVY AT 7800 FT AND PROCEEDED NE AND WAS WATCHING EVERYTHING. WHILE WATCHING THE PRECEDUS MAP DISPLAY, AT SEVERAL MI N OF BVY, THE CLASS B RING DISAPPEARED! I NEVER SUSPECTED THAT THE PRECEDUS WAS UNRELIABLE IN THAT FASHION. WHAT CAUSED MY VIOLATION: BAD SOFTWARE AND TRUSTING GPS ONLY WHEN I HAD A LORAN ALSO. PRECEDUS SOFTWARE VERSION 6.2. HOW TO CORRECT THIS: 1) WATCH BOTH. I WILL. 2) FORWARD THIS TO APOLLO BY EMAIL AND PHONE. I WILL, AND I WILL BE A PEST ABOUT IT.

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.