Lowrance electronic 212 - Manual (Page 46)

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country. This unit will pick the matching datum for you when you select the
grid. See the Datums section for more information.
The military grid reference system (MGRS) uses two grid lettering
schemes, which are referred to as standard and alternate MGRS on the
GlobalNav 212. Your position and datum in use determines which one to
use. If you use the standard, and your position is off significantly, then try
using the alternate.
See below for Map Fix information.
Note: When the position format is changed, it affects
the way all positions are shown on all screens. This
includes waypoints.
To change the format, highlight the “Position Format”
label on the “GPS Setup” menu, then press the right
arrow key. A screen similar to the one at right appears.
Press the up or down arrow keys to highlight the de-
sired format. Press the EXIT key to both select the for-
mat and erase the position format menu.
Map Fix
Map Fix is used with charts or maps. This system asks for a reference
position in latitude/longitude, which you take from a marked location on
the map. It then shows the present position as distance on the map from
that reference point. For example, if it shows a distance of UP 4.00” and
LEFT 0.50”, you then measure up four inches and to the left a half-inch
from the reference point on the map to find your location.
To use this format, you need to follow these steps in order. First, take your
map of the area and determine a reference latitude/longitude. (Note: in
order for this system to work, the latitude/longitude lines must be parallel
with the edge of the map. USGS maps are parallel, others may not be.
Also, this works better with smaller scale maps.) The reference position
can be anywhere on the map, but the closer it is to your location, the
smaller the numbers will be that you’ll have to deal with.
Once you’ve decided on a reference position, you’ll need to save it as a
waypoint. See the waypoint section for information on saving a waypoint
using the EDIT Position method. Save the reference position as a way-
point. Exit from the waypoint screens.
Press the MENU key, then select GPS Setup. Highlight Map Fix Setup