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post #31 of Old 03-19-2013
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Re: Ipad as sailing instrument....

Originally Posted by chef2sail View Post
Is it real time or is there a delay. I rememebr this was one of the issues you commented on before. I thought Open CPN could be as much as a 15 minute delay.
OpenCPN is completely real time. It gets its AIS data directly from my boat's AIS receiver, and operates in free-standing mode without any Internet connection.

I had expressed concerns about the website and MarineTraffic smartphone apps. Those get their data over the internet through a network of volunteer receiving stations that upload their data to a central server. The website warns against using their data for navigation. I am more concerned about blackout zones than time delays, since one of the "volunteer receivers" could go down at any time without warning, leaving certain regions with no coverage.

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1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1994 Mason 44 Firefly on loan from my BFF (West River, Galesville, MD)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)
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