33 CFR § 162.1 - General.

---
identifier: "/us/cfr/t33/s162.1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 162.1 - General."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "162.1"
section_name: "General."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "P"
subchapter_name: "PORTS AND WATERWAYS SAFETY"
part_number: "162"
part_name: "INLAND WATERWAYS NAVIGATION REGULATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 70034; DHS Delegation No. 00170.1, Revision No. 01.3."
regulatory_source: "CGD 75-082, 42 FR 51759, Sept. 29, 1977, unless otherwise noted."
cfr_part: "162"
---


# 162.1 General.

Geographic coordinates expressed in terms of latitude or longitude, or both, are not intended for plotting on maps or charts whose referenced horizontal datum is the North American Datum of 1983 (NAD 83), unless such geographic coordinates are expressly labeled NAD 83. Geographic coordinates without the NAD 83 reference may be plotted on maps or charts referenced to NAD 83 only after application of the appropriate corrections that are published on the particular map or chart being used.

[CGD 86-082, 52 FR 33811, Sept. 8, 1987]