When you are ready to return, activate the route you created in reverse order
(use “INV?” instead of “ACT?” when activating the route). The GPS 100 will
automatically guide you back to your destination by passing over the
waypoints you created! As an added benefit, you now have a route that will
take you back to your fishing spot at any time.
12.2 PARALLEL OFFSET NAVIGATION
Parallel offset navigation, introduced in Section 11.4, can be extremely
useful in either the marine or aviation environment. Offset navigation allows
you to translate your course to the left or right of the actual route by a distance
you choose. This feature can help you stay clear of dangerous areas and can
also help with specialized navigation such as shrimping, weather avoidance,
airway navigation, or search and rescue.
Suppose you are navigating in an area with a coast line as illustrated above.
You wish to navigate a course that is 3 nautical miles off the coast. Create
several waypoints along the coast line. Create and activate a route using
these waypoints, then go to the Offset Navigation/Mag Var Page to set the
offset distance.
12-2
WPT1
WPT2
WPT3
WPT4
3 NM
