Description
Multiply nonnegative speedKnots by elapsedHours for modelNauticalMiles.
Marine speed, thrust, and propeller ratios depend on a declared reference frame and coherent units. A scalar term usually describes only one part of vessel performance.
Multiply nonnegative speedKnots by elapsedHours for modelNauticalMiles.
When to use this tool
Use Nautical Time Distance Residual when you need one explicit marine performance ratio or residual.
How to use the tool and how it works
- Enter speedKnots, elapsedHours, loggedNauticalMiles. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read modelNauticalMiles, residualNauticalMiles. Use the output convention below.
Multiply nonnegative speedKnots by elapsedHours for modelNauticalMiles. Return loggedNauticalMiles minus that modeled distance as the residual.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| speedKnots | Speed Knots | Required. Finite number; minimum 0. |
| elapsedHours | Signed elapsed time in hours. | Required. Finite number; minimum 0. |
| loggedNauticalMiles | Logged Nautical Miles | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| modelNauticalMiles | Model Nautical Miles | Required. Finite number. |
| residualNauticalMiles | Residual Nautical Miles | Required. Finite number. |
{
"input": {
"speedKnots": 12,
"elapsedHours": 2,
"loggedNauticalMiles": 25
},
"output": {
"modelNauticalMiles": 24,
"residualNauticalMiles": 1
}
}Limitations and assumptions
- This assumes constant representative speed; currents, course changes, and instrument error are not separated.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use measured operating data and a vessel-specific propulsion model for performance predictions.
References
Similar or alternative tools
- Nautical Speed Over Water Ground Gap
Subtract nonnegative waterSpeed from nonnegative groundSpeed.
- Nautical Draft Forward Aft Average
Average nonnegative forward and aft drafts for meanDraft and subtract forward from aft for trim.