46 CFR § 197.458 - Gages and timekeeping devices.

---
identifier: "/us/cfr/t46/s197.458"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 197.458 - Gages and timekeeping devices."
title_number: 46
title_name: "Shipping"
section_number: "197.458"
section_name: "Gages and timekeeping devices."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "V"
subchapter_name: "MARINE OCCUPATIONAL SAFETY AND HEALTH STANDARDS"
part_number: "197"
part_name: "GENERAL PROVISIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703, 6101; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 76-009, 43 FR 53683, Nov. 16, 1978, unless otherwise noted."
cfr_part: "197"
---


# 197.458 Gages and timekeeping devices.

The diving supervisor shall insure that—

(a) Each depth gage and timekeeping device is tested or calibrated against a master reference gage or time-keeping device every 6 months;

(b) A depth gage is tested when a discrepancy exists in a depth gage reading greater than 2 percent of full scale between any two gages of similar range and calibration;

(c) A timekeeping device is tested when a discrepancy exists in a timekeeping device reading greater than one-quarter of a minute in a 4-hour period between any two timekeeping devices; and

(d) Each depth gage and timekeeping device is inspected before diving operations are begun.