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Going to a Destination
GPS is all about marking positions as waypoints and navigating to them using
the receivers steering guidance and map displays. Weve already seen how to use
the
M
key to store our present position, so its time to move on to the fun
part going to a destination. The
G
key, located on the left side of the keypad
above the
Q
key, is the primary tool used to select a destination waypoint or a
route to navigate. The
G
key can be used in three primary ways:
Pressing
G
once displays a list of all waypoints in memory, from which
you can select a single destination waypoint.
Pressing
G
followed by the
O
key provides a list of GOTO options
that lets you start a TracBack
TM
route, select a destination waypoint from
the nearest waypoints list, select a stored route to navigate, or cancel the
current GOTO destination.
Pressing
G
twice allows you to select an on-screen waypoint, navaid or
cursor position as a destination directly from the map display.
For our simulated trip, were going to select the preprogrammed tour route
(the second method), which will automatically place our vessel at the first route
waypoint. This will also give us an idea of how the
O
key is used throughout
the GPSMAP 180 system to provide context-sensitive options and functions. Lets
give it a try by activating the practice route stored in memory for navigation:
1. Press
G
. The waypoint list page will appear (if we were selecting a single waypoint to
navigate to rather than a route, we would highlight the waypoint and press
T
).
2. Press
O
to display the context-sensitive options available for the GOTO
function.
3. Use the
R
keypad to highlight the Select Route? option. Press
T
to confirm.
4. The select route page will appear, with the GPSMAP TOUR route highlighted.
5. Press
T
. The Map Page will reappear and display five waypoints chained together in
a simple route, with your boat at the first route waypoint.
9
GETTING STARTED
Using the GOTO key
A. Pressing GOTO once displays a list of all way-
points stored in memory. To pick a destination,
select the desired waypoint and press
EDIT/ENTER.
B. The GOTO options page allows you to either
start a TracBack route back home, select a des-
tination from the nearest waypoints list, or
select a route to navigate.