Join Date: Jul 2008
Location: Campbell River, British Columbia
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PNW conflicting current & Tide data
I've known this for quite a while but I thought I would post the data I have come up with for tomorrows currents at Sechelt Rapids and all the conflicting data. It happens that I have to take my work boat through there at full ebb and it's running pretty good at that time so I went through all my normal tides and current sources and here is what I come up with.
Sechelt Rapids - Current data - Saturday June 18th 2011
Nobeltec Tides and Currents Pro (laptop software)
Max 12:48 - 8.1 Kt ebb
CHS - Canadian Hydrographic Service (publication)
Max 12:53 - 11.6 Kt ebb
Aye Tides App (iPhone app)
Max 13:10 - 12.19 Kt ebb
Tide App (iPhone app)
Max 13:11 - 12.19 Kt ebb
Ports & Passes (publication)
Max 12:54 - 11.6 Kt ebb
Navionics (iPhone chartplotter app - embedded tides and currents data)
Max 12:50 8.12 Kt ebb
OpenCPN built in tide & current tables (Is not corrected for DST)
Max 12:11 + 1hr - 12.19 Kt ebb
Slack 15:39 + 1 hr
It's not just these rapids I get these wide variations, sometimes they're pretty close but in this case we have a variation of 4.09 kts. and I've seen a greater variation but this is quite substantial. Obviously if it's a critical crossing, I trust CHS or Ports and Passes but I use the others quite regularly for convenience purposes. In any case, on a large tide the numbers can be quite misleading in some cases.
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Last edited by Bilgewater; 01-15-2012 at 11:14 PM.
Reason: Added OpenCPN data