Narrative:

This event occurred on the third of three flights on the same day. I believed I was familiar with fdk; having been to the field three or four times. I received taxi clearance from ground; but had trouble identifying taxiway bravo. I then started to rely on my 'moving map' for aid in taxiing; but found myself unable to identify my exact position.ground helped me identify taxiway bravo; but I then nearly missed the left turn to taxiway alpha. Ground again supplied assistance and I turned left on alpha for active runway 30. I soon began to realize fdk has no (or few) taxiway markings for intersections or otherwise; which confused me since most airports I fly with multiple runways and a tower have standard taxiway markings and intersection markings. As a result I was calling ground; scanning for taxiway markings; and checking my moving map all at the same time.my 'moving map' showed me short of runway 30 and I continued. As I scanned for taxiway signs/markings; I noticed a white centerline ahead; and knew I was on runway 30 without clearance; a runway incursion. I advised ground who gave me progressive guidance back to the departure end of 30. I completed taxiing and takeoff without further incident.human performance considerations included the following contributing factors: fatigue from the third flight of the day. False assumptions; i.e. That every towered airport with multiple runways and taxiways has standard taxiway and intersection markings. My false assumption that ground is watching me and will give me instructions; so I know what to do. Over-reliance on my 'moving map;' which I later determined was not updating in 'real time' and hence showed a 'lagging' view of my position.in the future I will: take into account personal fatigue when flying long hours and will closely monitor my fitness to continue flight. Remember that 'moving maps' are an aid; not a substitute; for visual ground-based taxiing. If confused or disoriented in taxiing; I will stop and request progressive taxi instructions and; if necessary; will pause at every intersection to check location and verify with ground that it is safe and appropriate to continue. I will look for runway hold short markings! They were clearly visible for runway 30 on taxiway alpha; and I did not see the markings due to my inappropriately looking for taxiway signage and looking at the confusing moving map.

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Original NASA ASRS Text

Title: BE-36 pilot tired from a long day of flying and overly dependent on his moving map display; made multiple errors of judgment and execution when taxiing for takeoff at FDK. Ground Control was instrumental in the aircraft's eventual arrival at the departure end of the active runway.

Narrative: This event occurred on the third of three flights on the same day. I believed I was familiar with FDK; having been to the field three or four times. I received taxi clearance from Ground; but had trouble identifying Taxiway Bravo. I then started to rely on my 'moving map' for aid in taxiing; but found myself unable to identify my exact position.Ground helped me identify Taxiway Bravo; but I then nearly missed the left turn to Taxiway Alpha. Ground again supplied assistance and I turned left on Alpha for active Runway 30. I soon began to realize FDK has no (or few) taxiway markings for intersections or otherwise; which confused me since most airports I fly with multiple runways and a Tower have standard taxiway markings and intersection markings. As a result I was calling Ground; scanning for taxiway markings; and checking my moving map all at the same time.My 'moving map' showed me short of Runway 30 and I continued. As I scanned for taxiway signs/markings; I noticed a white centerline ahead; and knew I was on Runway 30 without clearance; a runway incursion. I advised Ground who gave me progressive guidance back to the departure end of 30. I completed taxiing and takeoff without further incident.Human performance considerations included the following contributing factors: Fatigue from the third flight of the day. False assumptions; i.e. that every towered airport with multiple runways and taxiways has standard taxiway and intersection markings. My false assumption that Ground is watching me and will give me instructions; so I know what to do. Over-reliance on my 'moving map;' which I later determined was not updating in 'real time' and hence showed a 'lagging' view of my position.In the future I will: Take into account personal fatigue when flying long hours and will closely monitor my fitness to continue flight. Remember that 'moving maps' are an aid; not a substitute; for visual ground-based taxiing. If confused or disoriented in taxiing; I will stop and request progressive taxi instructions and; if necessary; will pause at every intersection to check location and verify with Ground that it is safe and appropriate to continue. I will look for runway hold short markings! They were clearly visible for Runway 30 on Taxiway Alpha; and I did not see the markings due to my inappropriately looking for taxiway signage and looking at the confusing moving map.

Data retrieved from NASA's ASRS site as of July 2013 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.