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Old 03-19-2013
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Re: Ipad as sailing instrument....

Quote:
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 MarineTraffic.com 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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Formerly posted as "RhythmDoctor"
1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)
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