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[CA11] advanced sailing tools
05-31-18, 07:57 AM (This post was last modified: 06-06-18 11:25 AM by Chuck - Raymarine - Moderator.)
Post: #1
[CA11] advanced sailing tools
I used the layline feature last night for the first time utilizing boat polars. Wind speeds were relatively light, 6-8 Kt, but steady in both strength and direction. The laylines however were constantly and rapidly changing to the point where it would have been impossible to follow. I am wondering if changing the wind angle response and wind speed response would make a difference. Any thoughts on what a good setting would be ?
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06-08-18, 10:09 AM
Post: #2
RE: [CA11] advanced sailing tools
Welcome back to the Raymarine Forum Kevin,

I apologize for this late response. Our UK Product Support tech's experience when last using this feature is that he did not have to adjust anything and the Laylines were steady and very usable throughout the race.

The Layline feature will use the True Wind Angle and True Wind Speed calculated from Apparent Wind and boat speed. If any of the fundamental data (from sensors or required to calculate True Wind data) is not accurate or damped enough it would effect the Laylines. Additionally, if the wind is shifting as it may be in light airs the Laylines may shift around (it is noted that wind was steady when tested on your vessel).

The Polars table could also produce anomalies if there are errors, large gaps between the data, or if there are very few points of TWS & TWA. The software will interpolate but will be less accurate with larger steps in the table.
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06-11-18, 03:07 PM
Post: #3
RE: [CA11] advanced sailing tools
Can you provide an explanation for the data items "tack heading" and "Steer to layline"
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06-13-18, 03:31 PM (This post was last modified: 06-13-18 03:35 PM by Chuck - Raymarine - Moderator.)
Post: #4
RE: [CA11] advanced sailing tools
Tack Heading is the heading to steer to mirror the current true wind angle on the opposite tack.

I think it is also commonly called Tack Course.

The calculation is: Tack Heading = (Magnetic Heading + (2 * True Wind Angle)) % 360

So if the heading is 10° and the true wind angle is 30° to starboard then in order to get a true wind angle of 30° to port the boat would have to steer a heading of 70°.

[Image: attachment.php?aid=1964]

We are awaiting further information from engineering regarding the Steer to layline data item. This post will be updated upon receiving this information.


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