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Questions about Expedition features » No long range EC HIRES gribs? » Yesterday 10:12 pm

barne
Replies: 2

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Copy that. I understand. Thanks for the clarification.

Questions about Expedition features » No long range EC HIRES gribs? » Yesterday 1:33 pm

barne
Replies: 2

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I am trying to download the EC HIRES grib file for 16 days (384 hours). However, the downloaded file only covers 84 hours.

Does anyone else have more luck? Or is it like this for everyone?

Questions about Expedition features » Displaying AIS information in Expedition / Cmap » 6/23/2023 6:28 am

barne
Replies: 8

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One prerequisite is of course that "targets" are selected in "Display" setting.

Questions about Expedition features » Route optimization restricted to certain wind angles » 6/23/2023 6:08 am

barne
Replies: 3

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If you just adjust your polars (temporary) with very low boatspeed outside the desired wind angle range, I guess you should be able to get what you're looking for. 

Questions about Expedition features » Set and Drift » 9/26/2022 2:58 am

barne
Replies: 6

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Yes, your set and drift is a direct computation of you Heading and COG so if they are erratic, the set and drift values will be subsequently erratic.

Unless your H5000 system is really well calibrated, your set and drift numbers will more be a reflection of calibration errors rather than the actual set and drift. Set and Drift will be subject to:

* Error in boat speed calibration. Both the absolute value as well as the heel and linearity correction. Due to friction in the speedo (assuming you have a paddlewheel) the reading will not be linear so I would definitely populate the speed component of the heel correction whereas the actual heel dependance is more a hit and go thing.

* Error in compass calibration - I would recommend to calibrate the compass before every major regatta.

* Error in leeway - this might be a factor in your case. Check that the leeway is stated in the right direction (i e that your course is lower than your heading) and also doublecheck your leeway factor.

Questions about Expedition features » Trim log till race start? » 9/26/2022 2:45 am

barne
Replies: 2

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Don't know if it applicable to you but my process is:
When I am about to start sailing seriously that day I:

* open log folder
* turn off expedition
* Copy that day's log file and paste
* Remove the original
* Restart Expedition

Now I have only the important data in the log-YYYYMMMDD.csv which is uncluttered by previous data. But if I by some reason want to need to access previous data it is all there in the og-YYYYMMMDD - copy.csv file and can  load it through "Load track" or "Stripchart - load log data"

Questions about Expedition features » Damping » 7/23/2022 1:35 pm

barne
Replies: 20

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Sometimes it can help to put ridiculously big values on actions to check the effect of things. I sometimes do that on calibration both to see that there is an effect and in the desired direction. 

As Nick points out, damping settings many times does not affect numbers downstreams but only for when displaying data. 

I many times see laylines etc jump a lot in the start box if either the nav system or calibration isn't perfect. Then the set and drift will be more a result of that and not the actual current. Setting the damping high on set and drift (or as in the case of the start box lock them) might help.

Technical Q&A » Data input format? » 7/23/2022 1:19 pm

barne
Replies: 1

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It depends on what you want to do.

1) If you want to want to load a log file so you can look at the track or study variables in a strip chart you have two options in the tool ribbon:
(Load) Expedition standard csv format where nowadays the two first rows displays channels and channel numbers in the log file and then on rows 4 onwards containing BoatID, UTC and then pairs of channel numbers and values.
OR
(Load GPX) with a GPX file for tracks (using Lat and Lon only)

2) If you want to replay the log file you should be able to output the raw sentences through a UDP or TCP socket in the same pace as recorded and select network instrument as either Actisense ASCII, Digital Yacht RAW or Yacht Devices RAW depending on the RAW format.
 

Ventus Navigation » Pebble Watch » 6/19/2022 11:10 pm

barne
Replies: 1

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Pebble has been discontinued but an community-driven framework is in place: https://rebble.io/

I have been using pebble watches with a pebble.js script displaying data from an Expedition plugin (a websocket server using Expedition data). After installing the rebble.io framework, I was able to upload updated version of my pebble.js apps to the watches, no problems.

However, I don't know if you would be able to install the VentusPRO.pbw this way...

General Discussion » Performance analysis » 6/08/2022 2:03 am

barne
Replies: 2

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On a W/L race, it makes sense to use VMG%. Polar% is only percentage of speed in the direction you're sailing so if you were sailing around at very wide wind angles, you could potentially have great polar% but in reality not doing too wall in your race.

When analysing, remember that your boatspeed is probably much more accurate than your wind angle. Good boatspeed calibration is a lot easier to get than wind angle calibration that differs every day and during each day. When I do analysis I keep an eye at target bsp % as well, even though it only tells the half true, it will at least give a more accurate output.

In my experience (especially in a one-design fleet or sailing with similar boats) the best approach on W/L races is to use the data to analyse and present HOW you sail the boat (fast/low or high/slow, more or less heeled than normal, more or less rudder than normal) and then cross-reference that to your percieved performance against your competition.

Can you clarify your issue in your 2nd section? Are you referring to tuning the numbers in the start box?

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