47 CFR § 80.771 - Method of computing coverage.

---
identifier: "/us/cfr/t47/s80.771"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 80.771 - Method of computing coverage."
title_number: 47
title_name: "Telecommunication"
section_number: "80.771"
section_name: "Method of computing coverage."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "D"
subchapter_name: "SAFETY AND SPECIAL RADIO SERVICES"
part_number: "80"
part_name: "STATIONS IN THE MARITIME SERVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 151-155, 301-609; 3 U.S.T. 3450, 3 U.S.T. 4726, 12 U.S.T. 2377."
regulatory_source: "51 FR 31213, Sept. 2, 1986, unless otherwise noted."
cfr_part: "80"
---


# 80.771 Method of computing coverage.

Compute the + 17 dBu contour as follows:

(a) Determine the effective antenna height above mean sea level according to the procedures in §§ 80.757-80.761.

(b) Determine the effective radiated power according to § 80,765. Determine for each radial the distance from the antenna site to the + 17 dBu point of field strength using procedures of §§ 80.765 and 80.767.

(c) Plot on a suitable map each point of + 17 dBu field strength for all radials and draw the contour by connecting the adjacent points by a smooth curve.