Raymarine a65 Operation Instructions Manual page 154

Differences between Autorouting and Easy
Routing
There are important differences between the way
Navionics ® and Jeppesen
generation.
Navionics
Autorouting
Tidal height — Autorouting
Depth clearance avoids shallow
areas based on
the user defined
Minimum Safe
Depth setting
plus an additional
Navionics
safety margin.
Autorouting
assumes the
lowest tide level,
normally Lowest
Astronomical Tide
(LAT). The tide can
be lower than LAT
due to atmospheric
effects such as
high air pressure,
wind direction, etc.
Beam / Height Autorouting does
constraints not use the user
defined Minimum
Safe Beam or
Minimum Safe
Height settings to
generate routes.
Objects with beam
/ height constraints
are marked with
hazard waypoint
symbols, it is
critical that these
legs are checked
to ensure that
there is sufficient
clearance to avoid
the hazard.
154
® handle automatic route
C-MAP by
® Jeppesen
Easy Routing
Easy Routing
assumes that there
will be some tide.
The user must
apply their own
safety margin as
appropriate to
current conditions.
Route legs that
cross areas
shallower than
the user defined
Minimum Safe
Depth setting
are marked with
hazard waypoint
symbols, it is
critical that these
legs are checked
to ensure that
there is sufficient
tide to avoid the
hazard.
Easy Routing
uses the user
defined Minimum
Safe Beam and
Minimum Safe
Height settings
to determine
if sufficient
clearance is
available. The
user must
apply there own
safety margin as
appropriate to
current conditions.
The Height datum
must be checked,
as it could be
Mean High Water
Springs (MHWS)
or Highest
Astronomical Tide
(HAT). In both
cases the tide can
be higher than
the datum due
to atmospheric
effects such as
high air pressure,
wind direction, etc.
Caution: Easy Routing - Dredged
areas
The Jeppesen Easy Routing feature will
ignore some hazards in dredged areas.
Easy Routing is intended for passage
planning between harbors rather than
within a harbor.
Warning: Automatic route
generation
Routes created using automatic route
generation rely on data taken from
compatible electronic cartography and
user defined settings. As both of these
values are subjective the generated
route MUST be carefully checked and
if necessary edited BEFORE starting to
follow the route in the Chart application.
Warning: Traffic separation
Automatic route generation features
do not adhere to the Traffic Separation
Schemes identified in Rule 10 of the
International Regulations for Preventing
Collisions at Sea 1972 as amended.
Raymarine ®
that you do NOT use Automatic route
generation to create any part of a route
which will cross traffic lanes or pass
near to traffic separation lines. In these
situations Automatic route generation
MUST be switched Off and the route
or route leg MUST be built manually,
ensuring compliance to the rules laid out
in the above regulations.
Building a route using automatic route
generation
Automatic route generation can be used to create an
entire route or can be activated at any time when
building a new route.
From the Chart application:
1. Select Build Route from the chart context menu
or the Navigate menu.
The Build Route menu is displayed.
2. Select Autorouting / Easy Routing so that On
is selected.
Autorouting / Easy Routing can be switched
On and Off at any time during route building.
LightHouse multifunction display operation instructions
therefore recommends