Garmin eTrex Owner's Manual

Also see for eTrex - Hiking GPS Receiver: Features Owner's manual Manual Quick start guide Owner's manual

36North Reference‘Reference’ refers to the orientation of a map’s grid.Map makers try to align the vertical lines on a mapwith ‘True North’. True North is the direction fromany location on the earth’s surface to the “north pole”.Maps are typically referenced to true north. Because acompass points to magnetic north, not true north, mapsindicate the difference between true and magnetic northwith something called ‘declination’. The amount of decli-nation changes as you move around the earth. MagneticNorth is the direction in which a compass needle points.The eTrex bearings will correspond to the compass if theeTrex is set to magnetic north. Due to errors introducedwhen map makers flatten the earth’s sphere onto paper,not all of the grid lines drawn on the map point exactlyto the north pole, so the north indicated by the grid linesis called ‘Grid North’. But, the difference is usually smallenough that ‘Grid’ north can be considered the same asTrue North for travelling on land. If necessary, you cancorrect for the difference between Grid North and TrueNorth manually.To change the North Reference:1. Press the PAGE Button and switch to the ‘MENU’Page. Use the UP and DOWN Button and highlightthe ‘SETUP’ field. Press ENTER. The ‘SETUP’ Pageappears.2. Press the UP or DOWN Button to select ‘UNITS’.Press ENTER. The ‘UNITS’ Page appears.3. Press the UP or DOWN Button and select the‘NORTH REF’ field. Press ENTER.4. Press the UP or DOWN Button to select the desiredreference. Press ENTER. Press PAGE to return to thepage of your choice.When you select the ‘DEFAULTS’ field and pressENTER, the ‘UNITS’ page returns to the factory settings.You can use GARMIN’S‘MapSource®’ Map DataCD-ROMs to downloadwaypoints, tracks, androutes.‘MAGNETIC’ north isthe default northreference setting.ReferenceUnits ofMeasure