Category: AVA
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Reviewing AVA Reports
If you’re responsible for reviewing 7054 reports from the field, or you want to understand your reports better, this is for you. Many reports in the future will be coming from the AV Assistant (AVA) app that runs on mobile devices (currently only iPhones and iPads). Have you wondered exactly what AVA does and what…
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Anatomy of a GPS Fix – Part 2
In Part 1, we discussed what makes up a GPS fix and what the errors are. We also discussed how AV Assistant (AVA) calculates a Position Fix (PF) using HA, CA, and SE. In the diagram above, HA = Horizontal Accuracy (also known as EPE) – generally 50% confidence 2DRMS = 95% Confidence circle CA…
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Anatomy of a GPS Fix – Part 1
A GPS fix is actually a very complex series of calculations. A GPS receiver on the ground picks up timing signals from several GPS satellites and calculates your position in three dimensions, using what is known as “time of flight” triangulation. Each satellite has an atomic clock, accurate to 100 billionths of a second. Your…
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Redfish Cove Channel
Redfish Cove Channel Case Study This case study describes how Google Earth and AV Assistant work very well together to do aids verification and discrepancy reports. In this case, Redfish Cove Channel was a particularly egregious example of bad PATON channel data in the Light List. April 2019Clint O’ConnorU.S. Coast Guard AuxiliaryDistrict 7, Flotilla 9-10Cape…