notes.husk.org. scribblings by Paul Mison.

GPS satellite diagram, via AL@Latitude: Equator.

Sandia engineer Steve Yearout displays a 1/15 scale model of a NAVSTAR Block IIR GPS satellite: “Sandia sends sensors into space to detect nuclear blasts globally”. (Google cache; via.)

SatTrack Cam Leiden (via iamdanw):

In the evening of June 25 I by chance captured a GPS satellite that was decommisioned last year on photograph: Navstar 39 (USA 128, GPS 2A-27, 1996-056A). It showed up as a very bright small trail  and was flashing at a rate of  2-3 flashes per 10 seconds. 

Michael Zhang at Petapixel: Apple Moves One Step Closer Toward Location-Based Camera Disabling (via)

U.S. Patent No. 8,254,902, published on Tuesday, is titled, “Apparatus and methods for enforcement of policies upon a wireless device.”

Navstar by San Diego Air & Space Museum Archives on Flickr:

Providing continuous global coverage in all weather, the NAVSTAR Global Positioning System will give suitably equipped users three-dimensional positioning and velocity information and a precise timing reference in real time. Besides routine navigation, possible applications include search-and-rescue operations, land and aerial rendezvous, and geodetic surveys.

This Rockwell International promotional image presumably predates the launch of the first NAVSTAR satellite in 1978.

Chris Heathcote’s picture of my incoming flight stacking over north-west London last Thursday.

Don’t go where I can’t see you by Jeremy Wood:

GPS flight tracks with section of the River Thames in London
1:500 000 Scale, 100 km Grid

Indirectly via prosthetic knowledge. I also noticed his earlier My Ghost in Claire Dobbin’s new book, London Underground Maps, which seems to have some overlap with the previous three Capital Transport books on the map (which I should probably write about), but which also covers some new territory. I may have to buy it.