Analytics Visualization Types

Njord Analytics offers a variety of different visualization types which are available in different contexts, depending on the required data and the nature of the visualization.

Table

Available In Entire Day, individual races/trainings

Displays a tabular view showing data at configurable time intervals.

Table Configuration Options

• Interval: determines the time interval of rows displayed in the table; starting at the start time of the selected race, training or day.
• Displayed Metrics: determines the columns displayed in the table
• Show Averages: when selected, displays the average (mean) of values in the interval preceding each row's timestamp. Otherwise, the momentary value at each row's timestamp is displayed (using interpolation, if required).
• Exclude Maneuvers: when selected, excludes data before and after maneuvers (configurable in the boat's filter settings).

Line Chart

Available In Entire Day, individual races/trainings

Displays a line chart (strip chart) of one or more metrics for the selected time range.

Where targets are available, they are automatically shown as a grey line together with the the main variable (e.g. BoatSpeed and TargetBoatSpeed).

Hover over the chart to highlight a point in time and get an instant reading at that time.

Click and drag on the chart area to create one or more highlighted time ranges. An instant average is shown. Click the save icon at the bottom of the area to save the highlighted time range as a new training.

Click on the +/- buttons or use the slider at the bottom of the view to zoom into the chart.

Note that for bearing metrics like TWD, COG, or Heading, a continuous line is drawn where the value wraps around 0/360 degrees. The Y axis may span more than 360 degrees in case of multiple consecutive "turns" of the bearing value.

Line Chart Configuration Options

• Select one or more metrics, which will be shown as a vertical stack of individual line charts
• Damping: applies damping to the data with a damping/moving average window size of 1/100th of the displayed time range.

Scatter Chart

Available In Entire Day, Only Races, Aggregate all Dates in Event, individual races/trainings, Performance Database

Displays a scatter chart (X/Y chart) plotting data points by two selected metrics (X and Y axis).

In all modes except the performance database, data is automatically averaged into phases of a specific duration, to achieve a reasonable number of datapoints in the chart.

Hover over a data point to see a tooltip with exact values and the corresponding timestamp / phase duration.

Scatter Chart Configuration Options

• X and Y metric: determine which metrics are used to plot points in the chart
• Fit Curve: overlays a polynomial fit of the chosen order onto each data series, which may help indentify trends in a dataset or compare different datasets (port vs. starboard or different boats)
• Targets: displays a purple line showing the targets for the chosen Y metric (select TWS as the X metric). Targets can be either from the log file itself, or from a polar/targets configured for the boat.
• Performance Database: adds data series for comparison from the boat's performance database
• Color by Tack: breaks down the data points into separate port/starboard data series for comparison
• Highlight Top VMG%: adds a yellow highlight to all data points whose VMG% (percentage of VMG target) lies within the top 10 percentiles of VMG% of the entire dataset
• Exclude Maneuvers: excludes any data points that lie before and after maneuvers (configurable in the boat's filter settings)
• Filter: define additional filters to narrow the data in the chart, e.g. to remove outliers that disturb the analysis

Map

Available In Entire Day, Only Races, Aggregate all Dates in Event, individual races/trainings

Shows the track of one or more selected boats and any marks of the race/leg on a map.

Use the highlight mode and click on a track twice to mark a time range. You can save this highlighted time range as a new training.

Use the distance measurement mode and click on the map twice to highlight and measure a distance and bearing.

Click on the bearing control to select the "up" orientation of the map. Some options may not be available if either TWD data is missing or a race course has not been entered.

Map Mode: Speed

Click on the speed legend to change which metric is used to color the boat's track.

Map Mode: Tactical

In Tactical mode, the width of the track represents true wind speed (TWS, in the range shown in the legend, 10.5 to 17.5 kts in this example), and the color of the track represents shifts in true wind direction (TWD, around the average shown in the legend, 337 deg in this example).

Click on the color legend to select a coloring mode, either port/starboard or lifts/headers.

Map Tool: Ladders

When two boats are selected, click on the Ladders button to enable ladders between their tracks (connecting the boat's positions at equal times).

Map Tool: Maneuvers

Click on the Maneuvers button to show all analyzable maneuvers on the map, with maneuver loss calculated from average COG/SOG before the maneuver, and when zoomed in, a visualization of the loss calculation. Refer to the maneuver report for more details.

Statistics / Gain Loss

Available In Entire Day, Only Races, Aggregate all Dates in Event, individual races/trainings

Displays detailed statistics for selected metrics (average/mean, minimum, maximum, and standard deviation - a measure of the amount of variation of a set of values).

Supports comparing two boats (primary boat in blue, secondary boat in orange in this example).

Displays a gain/loss analysis for two boats for a selected time range (lineup). Gain is broken down into the forward direction (boat's heading), upward (perpendicular to forward direction), and the resulting gain (VMG, in TWD direction).

Targets

Available In Only Races, Aggregate all Dates in Event, individual races/trainings, Performance Database, Entire Day

Requires True wind speed (TWS) data

Displays a performance metric (BoatSpeed in this example) for either Upwind or Downwind data for all available true wind speed (TWS) buckets. The range of those performance metric values (min/max) in each TWS bucket determines the lower and upper end of the colored area.

The bold line represents the average of that data, which may optionally be calculated only from a subset of data in each TWS bucket. For example, you could chose to average only the top 30% of data in each bucket by VMG, which would represent your "best data" and would be suitable to determine more "ambitious" targets for the selected performance metrics, compared to averaging all data in each TWS bucket (adjust the "Percentiles" setting).

Displays targets from configured polars for the selected boat as purple lines for comparison.

Polar Diagram

Available In Only Races, Aggregate all Dates in Event, individual races/trainings, Performance Database, Entire Day

Requires True wind angle and speed (TWA/TWS) data

Displays BoatSpeed data relative to true wind angle (TWA) in certain true wind speed (TWS) buckets in a radial diagram.

Two labeled points on each TWS line represent the upwind/downwind angles with best VMG (target boat speed).

Consider limiting the visualization to only a small handful of TWS buckets, especially when comparing different performance database entries, or when comparing port to starboard data (enable Color by Tack in the settings menu), to keep the diagram readable.

Consider increasing the Smoothing setting if you have limited data and lines appear jagged. However, for best results, the more data you can collect the better.

Use the Speed Metric configuration menu to select either BoatSpeed or SOG as the speed metric.

Use the zoom buttons or your mouse wheel to zoom into crowded areas.

Use the Download button to download the polar data in one of the supported polar file formats:

• Expedition
• B&G
• Deckman
• Adrena
• ORC
• SailGrib

Bin Table

Available In Only Races, Aggregate all Dates in Event, individual races/trainings, Performance Database, Entire Day

Groups data into bins (buckets) along two configurable metrics. In each bin, a configurable aggregation is displayed (in this example, the average/mean, and count of values).

You can let a certain number of bins be automatically determined by from the range of data, or enter custom bin boundaries.

Correlation

Available In Only Races, Aggregate all Dates in Event, individual races/trainings, Performance Database, Entire Day

Explore how various metrics correlate and discover different ways to achieve your best performance in different conditions.

Sails / Comments

Available In Entire Day, individual races/trainings

Fleet Race

Available In Only Races, Aggregate all Dates in Event

Requires Races with complete race course (start line, marks, finish line)

Displays the average mark ranks, start line positions and distance sailed / time taken of each boat in the fleet.

A variant of this view is also available for each race individually, in a Fleet Race Report.

Maneuvers

Available In Only Races, Aggregate all Dates in Event, individual races/trainings, Entire Day

Displays a table of maneuvers of the selected maneuver type (tacks, gybes, turn ups, bear aways). The line chart(s) below show the values of selected Line Chart Metrics superimposed and aligned around the time of each maneuver (head to wind or TWA = 0, unless configured otherwise). Click on any maneuver to highlight it in the charts and table.