| other at right angles on a map. Grid systems allow  | 
  | you to locate or report on a specific point on the | 
  | map.  | 
Heading (hea)  | Compass direction on the present course.  | 
Latitude  | Angular distance North or South of the Equator.  | 
Longitude  | Angular distance West or East of the prime  | 
  | meridian.  | 
Navigation  | Traveling between two locations on a route with  | 
  | knowledge of the current position in relation to the  | 
  | route.  | 
Position  | Exact map coordinates of a given position.  | 
Time of Sunrise (tsr)  | Time of sunrise based on the current GPS  | 
  | position.  | 
Time of Sunset (tss)  | Time of sunset based on the current GPS  | 
  | position.  | 
Time to Waypoint (ttw)  | Estimated travel time to the next waypoint based  | 
  | on the current speed.  | 
UTC offset  | UTC means Universal Time, Coordinated. There  | 
  | are 25 standard time zones around the world that  | 
  | are all an integer offset of hours to   | 
  | |
  | offset +5 hours, have local time 17:00 (or 5:00  | 
  | PM). There are also some countries/places not  | 
  | using the standard time zones, they might be e.g.  | 
  | 5 hours and 45 minutes ahead of UTC.  | 
Universal Transverse Mercator (UTM) A grid system where the world is divided into 60 
Waypoint  | Position coordinates on a course stored in the  | 
  | Suunto X9 memory.  | 
WGS 84  | |
  | reference system (map datum) which defines the  | 
  | shape of an earth ellipsoid, its angular velocity,  | 
  | mass, and gravity.  | 
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