GPS Jamming and Spoofing Report

Introduction/Additional information: 

The GPS Jamming-Spoofing Report is intended to be used to transmit an alert if the ship systems sense a GPS jamming (loss of GPS) or GPS spoofing (incorrect position) event. When this happens, the last known good position and time will be transmitted in this message. When the event is over the same message can be sent with the complete bit set, with the time and position that GPS was regained. This message has been reduced in size to less than a single slot to provide increased probability of detection via satellite.

All directions are relative to True North, all positions are WGS-84 Datum.

  1. If the process on the ship detects a loss of GPS or a spoofed position then this message is sent. The spoofing is detected by comparing the difference between two different GPS receivers onboard. If they are at different locations on the ship they will have different positions unless being spoofed, at which time they will have the same position.
  2. Once the jamming or spoofing event is over another message is sent.
Permitted as from: 
01/10/2019
Registrant: 
USACE
Message number: 
8
DAC: 
367
FI: 
26
Version: 
0
Technical point of contact: 

Dr. Gregory Johnson

State: 
draft
Number of slots (max): 
1
Last modified: 
20210302T140231