USB Power Sensors, from a SBMS talk ( Power Point )
Compass use and limitations, from talk by K6JEY for the Jan 2009 SBMS club meeting ( Power Point )
Declination Diagram for North America.
Magnetic North and South Poles
Long Beach Airport Diagram

Doug's talk on Rubidium Sources before SBMS. ( Power point )
Beginner's Lab Gear ( Power Point )