Description
Retain or negate transverseCoordinate to obtain a starboard-positive value.
Port and starboard are vessel-relative directions. A transverse coordinate's sign depends on which side the source convention calls positive.
Retain or negate transverseCoordinate to obtain a starboard-positive value.
When to use this tool
Use Ship Frame Port Starboard Sign when you need to translate a stated vessel transverse sign convention.
How to use the tool and how it works
- Enter transverseCoordinate, positiveIsStarboard. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read side, signedStarboardCoordinate. Use the output convention below.
Retain or negate transverseCoordinate to obtain a starboard-positive value. Label zero centerline and nonzero coordinates using positiveIsStarboard.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| transverseCoordinate | Transverse Coordinate | Required. Finite number. |
| positiveIsStarboard | Positive Is Starboard | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| side | Side | Required. Text; maximum UTF-16 length 8192. |
| signedStarboardCoordinate | Signed Starboard Coordinate | Required. Finite number. |
{
"input": {
"transverseCoordinate": 2,
"positiveIsStarboard": true
},
"output": {
"side": "starboard",
"signedStarboardCoordinate": 2
}
}Limitations and assumptions
- This is a sign crosswalk rather than a position fix or navigational assessment.
- 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
Preserve the source coordinate frame and use a full spatial transformation when heading or global position is involved.
References
Similar or alternative tools
- Nautical: Vessel Port Star Board Coordinate Sign
Convert transverseCoordinate to a starboard-positive coordinate by retaining or negating it according to positiveSide.
- Port Starboard Signed Offset Crosswalk
Return the absolute offset as magnitude and infer port or starboard from its sign and positiveStarboard.