Magnetic deviation – compass and diving

Magnetic deviation is the error induced in a compass by local magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated.

http://en.wikipedia.org/wiki/Magnetic_deviation

So it’s a good idea to hold the compass and the torch in different hands !

Must have gps applications – Real time gps ski maps

„First real time interactive GPS ski maps hits the slopes. Find out what features are included with the Satski GPS:

  • Navigation
  • Resort Information
  • Emergency Feature
  • Ski Viewer
  • Real Time Replays
  • Google Earth 3D

product_gps

http://www.satski.com/Product/GPS_GPRS.aspx