Lowrance electronic AirMap 600c User Manual

Page 95

At left, Setup Loran TD option on the Coordinate System Menu.

At right, Configure Loran TD 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 refer-

ence point on the map to find your location.

To configure a map fix:

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 par-

allel with the edge of the map. USGS maps are parallel, others may not

be. Also, this works better with smaller scale maps.) The reference posi-

tion 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 can save it as a waypoint.

See the waypoint section for information on saving a waypoint. Save the

reference position as a waypoint. Exit from the waypoint screens.

Now press

MENU

|↓ to

GPS S

ETUP

ENT

|↓ to

OORDINATE

YS-

TEM

ENT

|↓ to

ETUP

ENT

. The following left screen appears, and

CALE

is highlighted. Press

ENT

and enter the map's scale. This is

generally at the bottom of the paper map. It's shown as a ratio, for ex-

ample 1:24000. Press

EXIT

and the unit returns to the Configure Map

Fix screen.