Logs can be filtered so that only part of data matching the filters is used in calculations and is shown on windows. All calculations, graphs, and screens, except the “Race” window, use only the filtered data to calculate and present it.
Fixed filter types
Legs
Filter only upwind or downwind legs
Tacks
Filter only port or starboard tack
Maneuvers
Remove maneuvers or show only maneuvers. Maneuver timings can be set in maneuver options.
Roundings
Removes or keeps mark rounding (the area where the upwind leg becomes the downwind leg and opposite). You can use this filter in three different ways.
Own Distance
It removes or keeps sailing at selected distance from the point where that boat changes from upwind to downwind leg. So it is that boat’s individual rounding that is taken.
In the example above, Noticia rounded the best around the mark and it has the shortest time to and from it’s turning point. Still, most probably they have lost to Solyd due to gate bias.
Common Distance
When common distance is used, there is a single line pulled at set distance from the rounding point. Filter keeps or removes all the sailing for boats from the moment they cross that line till they cross it again.
Once the single line is drawn, Solyd becomes the boat that did the best since they used the gate bias. You can use updist number to see how much less upwind distance Solyd sailed. (26m in this case which is 13m of bias times two). Solyd spent 6 seconds less in this rounding than Noticia.
Time
Time cuts the log at exactly the time set to and from the turning point. This way, on GPS track screen, you can compare the length of the lines of different boats.
In this example, StillCr sailed better downwind part (did more downwind meters than noticia in 30s). After the mark, Noticia did a bit better, red line ending up further up. Note that they have rounded at the same spot. Since time doesn’t consider mark bias, it is harder to compare those boats with the rounding of Solyd, but you can use the updist number to see who did the most upwind meters in rounding.
Multiple Filters
All of the fixed types can be used at the same time, for example upwind legs without the maneuvers will leave only straight lines.
Free filters
Apart from or together with the fixed filters, free filters can be used. Based on any value, it is possible to filter that value when higher or lower than:
- Log Average – an average of the whole log
- Selection Average – an average of the selection of the log
- Fixed Number – any other manually entered number
- All other logs – the value is higher than any other log. This also creates a Rank for that value, so you can see the ranking of the boats for this value.
Here we can see two free filters applied (SOG>12kts and heel>5 degrees). When you select the value and numbers, click on add to add that filter. Click clear to remove all the free value filters.
Remove and Keep Selection Filters
These filters are used to quickly remove or just keep time window selected. Move the app time sliders and if you want to filter only that part out, click on Filters/Remove Selection. If you want to keep that part only, choose Keep Selection
Use Clear Time Filters to remove only these filters.
Polar Graph Filtering
You can use polar graph to filter the data more visualy and user friendly. You do it straight in polar graph by long clicking on it.
You need to long click at the point you want to filter from. Reference Speed, Angle and VMG will be selected based on the place you clicked.
Then you can choose to filter by any of these possibilities.
For example, Speed above will leave only data where speed is higher than one at the clicked point (6.23kts in this case)
If you choose Filter Around option as on picture below, you can drag the slider to draw a circle around your point. Once OK is clicked, only the points in that circle (on both tacks) will be filtered.
Pure Sailing Filter Example
Only clean upwind sailing from the time range by selecting: “only upwind leg” + “remove maneuvers” + “VMG > fixed value” a bit under the usual VMG for the conditions. This leaves pure sailing and it is possible to get the data for only those periods in a quick way.
