---
kind: "section"
citation: "33 C.F.R. § 157.05"
title: "33"
number: "157.05"
heading: "Performing calculations for this part."
url: "https://uscodex.org/cfr/33/157.05"
---

# §157.05. Performing calculations for this part.


In this part, unless the context requires otherwise:

- (a) Formulas are in the International System of Units (SI);
- (b) Values used in those formulas must be in the International System of Units; and
- (c) **Forward and after perpendiculars are located at the forward end and at the after end of the length.** The forward perpendicular coincides with the foreside of the stem on the waterline on which the length of the vessel is measured.

## Notes

### Authority

Authority: 33 U.S.C. 1903; 46 U.S.C. 3703, 3703a (note); Department of Homeland Security Delegation No. 0170.1. Subparts G, H, and I are also issued under section 4115(b), Pub. L. 101-380, 104 Stat. 520; Pub. L. 104-55, 109 Stat. 546.

### Source

Source: CGD 74-32, 40 FR 48283, Oct. 14, 1975, unless otherwise noted.