Expedition Navigation Software 
1 | Questions about Expedition features » Routing for complicated environments and short time scales » 3/25/2024 8:47 am |
- nav
- Replies: 7
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It also makes sense to draw race notes over land areas and select "avoid in optimal routing" instead of using the "avoid land feature" as routings will run a lot quicker then.
| Software Releases » Grib server update » 3/24/2024 1:26 pm |
- nav
- Replies: 4
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In the download menu the resolution for ECMWF HRES is still named "0.4"
| General Discussion » SHOM or Proudman Tides for routing analysis. » 11/17/2023 7:13 am |
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- Replies: 1
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Hello,
I'd like to carry out a statistical routing analysis for the Fastnet race for the past 10years considering not only wind but also current.
For wind I'm going to use the Copernicus reanalysis grib files. That's all straight forward.
For current I intent to use SHOM or Proudman tides (unless there's an even better way(?) ). So far I don't have a subscription, so before doing that I'd like to understand a few things.
1) Are both (Proudman and SHOM) usable in Expedition? On the Expedition website under sales I only find SHOM tidal currents for "Northern and Western France"
2) If both are usable: What is the difference between them? Is there one model considered to be "better"?
3) How far do the models rach back into the past? Is it possible to use them for routings for the past 10years?
4) And now the tricky one:
I expect that the SHOM / proudman models use different tidal coefficients for different dates, so the strength of the current in a certain area will vary over the tidal cycles.
While I can offset the starting time of the multi-year routings to always have the same relation to high tide like on Fastnet starting day (by offsetting the routing starting times by for example one tidal cylce / 12h 25min) and thereby getting at least the right current direction this would however lead to varying current strengths depending on the varying tidal coefficient.
So ist there any way to use the "fixed" current of the 2025 Fastnet with its tidal coefficient for all the routings with the weather from the past 10 years?
| Suggestions for new features and capabilities » Apparent Wind Direction » 3/27/2022 7:31 am |
- nav
- Replies: 3
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No, as the wind shadow follows the apparent direction, not the true one.
When thinking a bit more about it it would also be good to have a variable “apparent wind direction on opposite tack” to judge if in or out the dirty air of a boat to leeward and behind when expecting both to gybe simultaneously.
| Suggestions for new features and capabilities » Apparent Wind Direction » 3/26/2022 8:14 am |
- nav
- Replies: 3
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Hello,
is it possible to add a variable to Expedition showing the apparent wind direction?
On a downwind course I'd like to be able to check with a handbearing compass if we are already affected by the wind shadow of another boat parallel to windward.
| General Discussion » Current Grib for Middle Sea Race » 10/17/2021 11:41 pm |
- nav
- Replies: 5
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Thanks!
the Open WRF is higher resolution (both temporal and spatial) than the RTOFs. But it is automatically coming together with wind data. Is there a way to run a routing with Open WRF currents but let's say ECMWF wind data / without using the Open WRF wind data?
| General Discussion » Current Grib for Middle Sea Race » 10/15/2021 12:23 am |
- nav
- Replies: 5
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Hello,
which current grib files (source) do you recommend for the Rolex Middle Sea Race?
| Technical Q&A » Decimal places of Exp. remote channels on H5000 » 6/18/2021 1:06 am |
- nav
- Replies: 1
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Hello,
Is there a way to change the decimal places of the expedition remote channels that are displayed on the B&G H5000 graphic displays?
I‘m sending mark bearing via Expedition remote channel through Ethernet to the H5000 websocket.
In Expedition settings / Channels the decimal places are set to 0. Mark bearing inside Expedition is shown correctly without decimal places.
But on the cockpit displays Mark bearing always shows 2 decimal places. So for example a bearing of 200deg is shown as 200.00.
As the number gets quite long it’s scaled smaller on the display wich makes it harder to read.
2deg is shown as 2.00, which from a distance might be read as 200..
As I already set the decimal places to 0 in Expedition this might be a setting to make inside the h5000. But I haven’t found a way to change the decimal places there.
Did anybody experience the same and found a solution ?
| Software Releases » 11.8.5 » 3/19/2021 8:25 am |
- nav
- Replies: 7
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When downloading Squid GEFS 56km (All) 0.5° only the control run is donwloaded, not all 20 ensembles.
| Technical Q&A » Expedition Calculations & Calibrations » 3/15/2021 10:46 am |
- nav
- Replies: 5
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Hello,
1) When I select "Leeway from heel and bsp" in Exp. Calculations. Which K-factor is taken?
Under "Exp Calibration" I can enter a number for Leeway in a 1x1 table. But the description below the table says "TWA across table, TWS down table" which is a bit misleading.
Is this where the K factor has to be entered?
2) If I understand correctly under Exp Calibration I can calibrate for example my BSP for heel and speed correction if my instrument system is not capable to do so.
So I filled out the table there and set it active.
I tried this in a simulation where I have Deckman running in simulation mode and DfW2Exp sending the numbers to Expedition - the closest I can get to simulate an instrument connection without being on board. I expected the Expedition BSP to differ from the DfW2Exp input BSP by the numbers in the table, but it doesn't. Is this a pure simulator issue or am I doing something essentially wrong?