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MARINE MODE PAGES AND FEATURES
Marine Mode operates in a similar fashion to Aviation Mode, while
also providing many features and operations of Automotive Mode.
Refer to the corresponding sections in the Aviation and Automotive
sections for further details.
Refer to page 29-36 in the “Aviation Mode Pages and Features”
section for more details about the Map Page.
The location marker (icon) that shows your travel on the Map Page
is a triangle symbol in Marine and Automotive modes. The
GPSMAP 496 always turns on in location mode, with the last known
location centered on the map. When you press the
GPSMAP 496 enters pan mode, which moves the map to keep the
white arrow (map pointer) within the screen area.
In Marine Mode, by default, ﬁve user-selectable data ﬁelds appear
on the right side of the screen that can be conﬁgured to show any
one of the possible data options. You can also add additional data
ﬁelds to the page or select a full screen map without data ﬁelds.
Press the zoom keys (IN and OUT) to change the map range. Some
items on the map only appear if the map is zoomed in to a speciﬁ ed
ENTER to quickly declutter (remove unwanted items)
from the Map Page.
MENU to open the options menu for the Map Page.
• Show and hide the heading line from the options menu.
• Use the
ROCKER to measure the distance between two
objects on the map.
• Change the page layout and data ﬁelds to customize the Map
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During active navigation, the Compass Page guides you to your
destination with data ﬁelds and a graphic compass screen with a
Compass Page in Marine Mode
Compass arrowData ﬁelds
The middle of the page features a rotating compass ring that shows
your course over ground (track) while you are moving. Your present
course over ground is indicated at the top of the compass ring. The
direction of the destination (bearing) relative to the course over
ground is indicated by an arrow in the middle of the compass ring
and a course to steer “bug” on the outside of the compass ring.
The compass ring and bearing indicators work independently to
show the direction of your movement and the direction to your
destination. If the arrow points up, you are going directly to the
waypoint. If the arrow points any direction other than up, turn
toward the arrow until it points up, then continue in that direction.
NOTE: You must be moving for the compass to accurately
update and show your heading.
The right side of the Compass Page shows user-selectable data
ﬁelds that show additional information during active navigation.
For deﬁnitions of data ﬁeld settings, refer to
page 174 of the
Compass Page Options
The options menu on the Compass Page allows you to customize
the Compass Page. Like the Map Page, the Compass Page features
user-selectable data ﬁelds on the right side of the screen. When the
Compass Page is open, press MENU to open the options menu.
Show Course Pointer/Show Compass—toggles between showing
the Course Pointer, which shows how far off you are from your
course and how to get back on course, or showing the compass
arrow. The Course Pointer is also referred to as a
CDI or Course
Show/Hide Bug Indicator—toggles between showing and hiding
the course to steer bug indicator (the purple tick mark on the
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Using the Marine Timer
The Marine Timer, speciﬁcally designed for sail boat racing,
allows you to easily count up or down speciﬁed time increments.
As common in sail boat racing, there is often a 5 minute warning
countdown, followed by a 4 minute preparation countdown, and
ﬁnally a one minute ﬁnal countdown. You must change the
Page layout to use the Marine Timer.
To open the Marine Timer:
1. Press PAGE repeatedly until the Compass Page appears.
3. Use the
ROCKER to highlight Set up Page Layout, and
4. Highlight 2 Columns With Timer
, and press ENTER. The
Marine Timer appears in the lower right corner.
To use the Marine Timer:
1. Press the ROCKER up or down to select the time you want
to count. Five (5) minutes is the default.
ENTER to start the timer. Use the ROCKER during the
timing to quickly select a different length of time.
ENTER to stop timing.
Marine Timer on the Compass Page
As discussed previously, the timer is set to count down ﬁve minutes.
If you want to change the length of time and the behavior or the
timer, open the Timers Setup tab in the Main Menu.
To set the Marine Timer:
1. Press MENU twice to open the Main Menu.
2. Press the
ROCKER down to select Setup and then right to
select the Timers sub tab.
Stop next to Marine, and press ENTER to change
the timer’s behavior. Highlight the behavior you want, and
4. Highlight the time ﬁeld, press
ENTER, and then use the
ROCKER to enter a new time. The maximum time is 60:00
(minutes: seconds). Press ENTER when ﬁnished.
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The DSC Page allows you to control and set up the Digital Selective
Calling (DSC) features on the GPSMAP 496.
DSC uses marine VHF radio and GPS technologies to transmit
and receive location information. The chartplotter repeats the call
properties received from the VHF radio on the chartplotter. The
GPSMAP 496 requires input from a DSC enabled VHF radio to
show position, and to sound/show alerts from a distress call or
position report. Conversely, the VHF radio requires input from a
GPS to transmit position coordinates for a distress call or position
report. For connection information, refer to “Connecting the Power
and Data Cable” on page 158.
An emergency DSC distress call allows a vessel in trouble to
transmit a substantial amount of information in a single transmission
or call, without the need for voice communication. When any
nearby rescuer receives the DSC signal, an alarm sounds and they
immediately receive the location of the caller. The rescuer can then
choose to navigate to the caller’s location to assist, or forward the
call on to the Coast Guard. When the Coast Guard receives the call,
they can immediately access the caller’s information (such as who
they are and the type of vessel) in their database while they are in
transit to the caller’s location. A non-emergency DSC Position Report allows mariners to exchange
and show the positions of one another. When a DSC position is
received, the mariner can choose to create a waypoint or to show the
received location on an electronic map.
Anytime a vessel receives a DSC call, they can store and quickly
navigate to that location using a Go To. This makes DSC a time
saver, especially in an emergency situation. In order to use DSC,
users must ﬁrst register their VHF radio with the FCC and receive a
Maritime Mobile Service Identity (MMSI) number.
For more information about Digital Selective Calling and Maritime
Mobile Service Identity (MMSI) numbers, refer to page 168 in the
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MARINE MODE PAGES AND FEATURES > DSC
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Understanding Distress Calls
When the GPSMAP 496 receives a distress call from a connected
DSC enabled VHF radio, an alert message and notiﬁcation page
appear, and an alarm tone is sounded.
Distress calls are shown in the
DSC Call List, and Log with a checkered symbol.
You also have the ability to input a caller’s name, if it is known.
The caller’s name replaces the MMSI number as a reference when
Understanding Position Reports
A position report is similar to a distress call except no alarm is
sounded. Position reports are not broadcast to all DSC users and are
shown with a boat symbol.
Receiving DSC Calls
Each time you receive a distress call or position report, a
Notiﬁcation page appears, and the call is placed in the DSC Call List
and Log. The Notiﬁcation page contains information about the call
including: the type of call (distress or position report), the MMSI
number of the caller, a user deﬁnable name, the time and date of the
call, the bearing and distance from your current position, and the coordinates of the caller. To see the callers location on a map,
select the Show Map button. To create a waypoint at the caller's
location, select the
Create Wpt button. To close the Notiﬁcation
page, press the QUIT key.
When a Distress Call or Position Report is placed in the Call List
and Log, the information on the Notiﬁcation page is retained.
To review a DSC call or log entry, highlight the entry and
press ENTER. The DSC Entry Review page is identical to the
Notiﬁcation page with one exception, the entry can be deleted.
To review a call or log entry:
1. Open the Call List or Log from the DSC tab
2. Press up or down on the
ROCKER to highlight the call you
want to review.
ENTER to open the DSC Entry Review Page.
DSC Entry Review Page
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