Husqvarna 420 Operator's Manual page 17

Search method 2: Follow guide wire
The robotic lawnmower runs irregularly until it reaches the
guide wire. Then the robotic lawnmower follows the guide
wire to the charging station.
The guide wire is an extra wire that is laid from the
charging station towards a remote part of the working
area or through a narrow passage to be then connected
with the boundary wire, see 3.6 Installation of Guide Wire
on page 28.
Automower ® 450X can have up to three guide wires and
Automower® 430X up to two guide wires.
Automower® 420 has only one guide wire.
This search method makes it easier for the robotic
lawnmower to find the charging station beyond many or
large islands, narrow passages or steep slopes.
The benefit of this search method is shorter search times.
Search method 3: Follow boundary wire
The robotic lawnmower operates irregularly until it
reaches the boundary loop. Then it follows the boundary
loop to the charging station. The robotic lawnmower
randomly selects to travel clockwise or anticlockwise.
This search method is suitable in an installation with
an open lawn space, wide passages (wider than about
3 meters) and no or only a few small islands.
The benefit of this search method is that there is no need
to install a guide wire.
The disadvantage is that some tracks can be formed
in the lawn alongside the boundary loop. The search
time will also be longer if there are narrow passages or
numerous islands in the installation.
As a rule, this search method is used only if the robotic
lawnmower can not find the charging station using search
method 1 or 2 within the expected time period.
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