Polaris Xr-5DC, Instruction Manual, Page: 1 / 12

Model: Xr-5DC
The prime meridian runs from the north to south pole through Greenwich, England.
Magnetic North
Represent the direction of the north magnetic pole from the observer's position. The direction a
compass points.
Navigation
The act of determining the course or heading of movement which will lead to the user's destination.
Navigation Pointer
A quadrant with a arrow kept pointing to the direction of destination.
Position Fix
The GPS receiver's computed position coordinates.
Prime Meridian
The zero meridian, used as a reference line from which longitude east and west is measured. It
passes through Greenwich, England.
Time To First Fix (TTFF)
If user has not used this GPS unit for several months, the almanac data for the satellites may be out
of date. The unit is capable of recollecting this information on its own, but the process can take
several minutes. Time to First Fix (TTFF) is the time it takes a GPS receiver to find satellites after
the user first turns it on (when the GPS receiver has lost memory or has been moved over 300 miles
from its last location).
Vertical Line
The short line which is silk-screened vertically on the LCD panel symbolizing user's heading.
Warm Start
Power-on sequence when a receiver already has valid almanac data, but must download ephemeris
data for each of the satellites used to establish a position fix.
Waypoints
Waypoints are locations saved in user's GPS unit. These are locations user may later want to return
to or review.
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POLARIS USER MANUAL
Instruction Manual