Metrics
Below is a list of all standard Njord metric names. These have special meaning in the software, are used to calculate derived metrics, and some features are only enabled when these metrics are present.
When loading data from any data source, we will rename data to match these standard metrics. When importing data in CSV format, name the CSV columns to match the metric names below for the best experience.
Depending on the data source, you can include any number of additional metrics with custom names. They will all be shown in the software, but don't carry any special meaning.
| Name | Description | Unit | Calculated |
|---|---|---|---|
AWA | Apparent wind angle | degrees | |
AWA_Abs | Apparent wind angle (absolute) | degrees | yes |
AWS | Apparent wind speed | knots | |
BelowLine | Distance from boat's bow to start line (perpendicular), from log file | meters | |
BelowLineCalc | BelowLine, calculated from start line entered for race | meters | yes |
BoatSpeed (BSP) | Boat speed (speed through water) | knots | |
BoatSpeedPercOfPolar (Polar%) | Boat speed as a percentage of the polar target speed (requires a polar to be set for the boat) | percent | yes |
BoatSpeedPercOfTarget (BSP%) | Boat speed as a percentage of the target boat speed from the polar | percent | yes |
COG | Course over ground (true or magnetic) | degrees | |
COG_Mag | Course over ground (magnetic) | degrees | yes |
COG_True | Course over ground (true) | degrees | yes |
CurrentDirection | Direction of current (set) | degrees | |
CurrentSpeed | Speed of current (drift) | knots | |
DistanceToLeader | Distance to leader (available in race with full course) | meters | yes |
Foiling | 1 if foiling, 0 if not foiling | ||
Forestay | Forestay load or tension | ||
Heading | Heading (true or magnetic) | degrees | |
Heading_Mag | Heading (magnetic) | degrees | yes |
Heading_True | Heading (true) | degrees | yes |
Heel | Heel (roll) | degrees | |
Heel_Abs | Heel (absolute) | degrees | yes |
Heel_Lwd | Heel to leeward — sign-adjusted so that positive always means heeling to leeward regardless of tack | degrees | yes |
Lat | Latitude (as recorded) | degrees | |
LatBow | Latitude of boat's bow | degrees | yes |
LatCenter | Latitude of the center of the boat | degrees | yes |
LatStern | Latitude of boat's stern | degrees | yes |
Leeway | Leeway angle — angular difference between the boat's heading and its actual course through the water | degrees | |
Leg | (available in race with full course) | yes | |
Lon | Longitude (as recorded) | degrees | |
LonBow | Longitude of boat's bow | degrees | yes |
LonCenter | Longitude of the center of the boat | degrees | yes |
LonStern | Longitude of boat's stern | degrees | yes |
Log | Distance traveled over ground | meters | yes |
LogAlongCourse | Distance traveled along race course axis | meters | yes |
MagneticVariation | Local magnetic variation (declination), used to convert between true and magnetic bearings | degrees | yes |
PolarBoatSpeed | Target boat speed from the polar for the current TWA and TWS | knots | yes |
Portlat | Latitude of port / pin end of line | degrees | |
Portlon | Longitude of port / pin end of line | degrees | |
Rank | (available in race with full course) | yes | |
ROT | Rate of turn | degrees per second | yes |
Rudder | Rudder | degrees | |
Rudder_Abs | Rudder (absolute) | degrees | yes |
Rudder_Lwd | Rudder to leeward | degrees | yes |
SOG | Speed over ground | knots | |
Stbdlat | Latitude of starboard / RC end of line | degrees | |
Stbdlon | Longitude of starboard / RC end of line | degrees | |
TargetBoatSpeed | Target boat speed from the polar for the current TWA and TWS | knots | yes |
TargetForestay | Target forestay value from the polar | yes | |
TargetHeel | Target heel from the polar | degrees | yes |
TargetRudder | Target rudder from the polar | degrees | yes |
TargetTrim | Target trim from the polar | degrees | yes |
TargetTWA | Optimum TWA (best VMG angle) for the current TWS from the polar | degrees | yes |
TargetTWADelta | Difference between actual TWA and the target TWA from the polar | degrees | yes |
TargetVMG | Target VMG from the polar at the optimum TWA for the current TWS | knots | yes |
Target<Anything> | Target for any other <Anything> metric | ||
TimeLocal | Seconds since midnight (local time) | seconds | yes |
TimeToBurn | Time available to burn before crossing the start line early (requires BelowLine or BelowLineCalc and TimeToGun/TimeToGunCalc) | seconds | |
TimeToGun | Time to gun, from log file (negative after the start) | seconds | |
TimeToGunCalc | Time to gun, calculated from the race start time entered in Njord (negative after the start) — use this when the log file does not contain TimeToGun | seconds | yes |
TimeToLine | Estimated time to cross the start line at current boat speed | seconds | |
TimeUTC | Seconds since midnight (UTC) | seconds | yes |
Trim | Trim (pitch) | degrees | |
Trim_Abs | Trim (pitch) absolute value | degrees | yes |
TWA | True wind angle | degrees | |
TWA_Abs | True wind angle (absolute value) | degrees | yes |
TWD | True wind direction | degrees | |
TWS | True wind speed | knots | |
VMC | Velocity made on course | knots | yes |
VMG | Velocity made good | knots | yes |
VMGPercOfTarget (VMG%) | VMG as a percentage of the polar target VMG | percent | yes |
XTE | Cross track error | meters | yes |
Yaw | Yaw angle | degrees |