Yes, but you need grib forecast data or be in an area that has integrated tidal currents.

With varying tides, the times will be different on each tack/gybe for each side (left or right). For example, 'Tide left port time' / 'Td L Pt' is the time on port on the left side of the course. Td L Tm is the sum of the two for the left side of the course.

Hello,
In addition to my comment above I played around a bit more with the laylines in simulation mode.
I'm using Expedition v.10.2.5.

1) I set up an upwind course at the southern end of the Isle of Wight in an area with strong adverse current on the starboard side and much less adverse current on the port side of the course.
Now numbers in the number box are telling me that going right is 6 min faster which can not be right! Also "Td R Prt" (the time on port on the right side of the course) being 11min faster than "Td L Pt" (the time on port on the left side of the course) must be wrong.




2) I did the same in a location where the adverse current is much stronger on the port side of the course. Here the numbers are telling me now that going to the port side of the course is much faster...



3) I wanted to check what happens with the layline numbers on a downwind course but found another strange thing.
In a certain mark bearing of the the wind the layline time on port tack (Tm on P, so without grib current) increases rapidly to unrealistic values:

In the first picture TWD is 360°, MkBrg is 179°, MkRng is 1.66nm.
Tm on P is 3h 42 min...



Moving the mark just a little bit, the MkBrg is 181°, almost same MkRng and same TWD.
All of a sudden the Tm on P is 5min 16sec, which is correct.





Did the same for a different wind direction with a similar wrong result.



I never experienced this during sailing last year. This might be an error that came with a recent update (?).


 

Hi,

Nice job explaining your question!   I've used Expeditions layline times with predicted tides for several years now with great success... but I must admit I never bothered to analyze the nomenclature for the names of the variables.   I simply did like you - simulated a case where there was an obvious correct answer (eg. stay out of adverse current or stay in the strongest favorable current) and put up all the number boxes including the "normal" expedition lay times (without current) for comparison - and picked the two variables that gave me the layline times from where I am using predicted tides... I never bothered to figure out what the names of the variables meant.   

I just replicated your questions - and it appears that the "L" and "R" (left and right) names are "backwards"... that is TD L Time is really the time if you hit the right side layline and vice versa.   

But aside from that "name" bug - I've found the predicted tides numbers to be really good - and quite helpful.    And of course if you are using them to "pick a side"  you would have to know that the names are backwards. 

It's probably worth keeping the "normal" layline times (without current)... on your screen too.... for a reality check!

As for your other reported bug.... (port tack layline time (the "normal"variable incorrect when upwind of a leeward mark) Nick will have to look at that for sure.   It may be due to something with the simulator - which would explain why we have not seen it when sailing.     I was able to replicate the problem.. only the port tack layline time has the bug - and I've only been able to make it happen when sailing to a downwind mark - and only when I'm upwind of that mark.. when my boat gets near the port tack layline - the variable reads correctly.    

Thanks
Peter

This one is now solved (v. 10.2.11).
'Td R Prt' as an example is now the time sailing on port tack on the right side of the course. The Course side is always (upwind and downwind) defined looking upwind.

Exp will try to use the grib data before the models. It can't use C-Map tidal currents for anything.