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 map with‘True North’. True North is the direction from anylocation on the earth’s surface to the “north pole”. Mapsare typically referenced to true north. Because a compasspoints to magnetic north, not true north, maps indicatethe difference between true and magnetic north withsomething called ‘declination’. The amount of declinationchanges as you move around the earth. Magnetic Northis the direction in which a compass needle points. TheeTrex bearings will correspond to a compass if the eTrexis set to magnetic north. Due to errors introduced whenmap makers flatten the earth’s sphere onto paper, not allof the grid lines drawn on the map point exactly to thenorth pole, so the north indicated by the grid lines iscalled ‘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.‘MAGNETIC’ north isthe default northreference setting.ReferenceUnits ofMeasure