Narrative:

Private float plane took off and climbed out without any communication on unicom frequency. I made all reports, but did not see him during descent and flight. I believe that the large round engine on dhc- 2 beaver restr seeing other aircraft. I was also watching for other reported traffic.

Google
 

Original NASA ASRS Text

Title: NMAC BTWN 2 FLOAT PLANES NEAR A LAKE PORT. ONE WAS APCHING TO LAND AND THE OTHER DEPARTING.

Narrative: PVT FLOAT PLANE TOOK OFF AND CLBED OUT WITHOUT ANY COM ON UNICOM FREQ. I MADE ALL RPTS, BUT DID NOT SEE HIM DURING DSCNT AND FLT. I BELIEVE THAT THE LARGE ROUND ENG ON DHC- 2 BEAVER RESTR SEEING OTHER ACFT. I WAS ALSO WATCHING FOR OTHER RPTED TFC.

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.