Lowrance electronic iWAY 350C - Manual (Page 66)

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you, it will begin generating a new one, based on your new position.
This feature is particularly handy for dealing with temporary or local
conditions that interfere with a route. When construction diverts you
from the route the iWAY recommended, you'll often find that the iWAY
recalculates your route and builds one that matches the official detour.
The most important step in learning how to follow iWAY's routes is
practice. Use the iWAY as often as possible and pay attention to the
way it "thinks." With time you will learn exactly how to get the most
out of the navigation provided by this GPS unit.