Narrative:

While enroute; we were using xm (satellite radio) radar and ads-B (automatic dependent surveillance-broadcast) radar data to deviate around weather. Due to the limitations of these delayed data systems; we were also attempting to remain in VMC conditions to allow for real time deviations. During this time we were changing altitude to aid in this (successful) effort. At one point; we allowed the aircraft to deviate slightly more than 300 feet. We eventually obtained a block altitude to provide us with the required flexibility. We should have obtained the block altitude earlier or have stayed on our assigned altitude until we obtained an amended clearance.

Google
 

Original NASA ASRS Text

Title: Pilot reports an altitude deviation while attempting to avoid weather using XM (satellite radio) and ADS-B (Automatic Dependent Surveillance-Broadcast) radar data.

Narrative: While enroute; we were using XM (satellite radio) radar and ADS-B (Automatic Dependent Surveillance-Broadcast) radar data to deviate around weather. Due to the limitations of these delayed data systems; we were also attempting to remain in VMC conditions to allow for real time deviations. During this time we were changing altitude to aid in this (successful) effort. At one point; we allowed the aircraft to deviate slightly more than 300 feet. We eventually obtained a block altitude to provide us with the required flexibility. We should have obtained the block altitude earlier or have stayed on our assigned altitude until we obtained an amended clearance.

Data retrieved from NASA's ASRS site 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.