Join Date: Feb 2010
Location: Narragansett Bay
Thanked 327 Times in 307 Posts
Rep Power: 8
Re: Reasons for knowing TVMDCAW
GPS satellites do not have to fall out of the sky. They are occasionally shut down or down for maintenance. The system is supposed to keep enough up and running that you never know. Not always the case. In aircraft, there is integrity monitoring to determine whether there are sufficient signals to complete a course, not just receive your current position. They are also principally designed for military use and you can be certain they will jam them as they see fit for security purposes.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
In the harsh marine environment, something is always in need of repair. Margaritas fix everything.