Raymarine SL72 Owner's Handbook Manual page 174

Chapter 8: Installation 8-7
Mounting surface: sailboats
The scanner unit can be installed on a mast platform, an arch, or a bridge
structure. Make sure that the platform surface is flat and the radome scanner
unit drain hole is not obstructed. Raymarine recommends that radome scanner
units are best suited for sailboat operation as open array systems are more
difficult to protect from ropes and sails.
For sailboat installations, Raymarine offers a universal mast mount kit for the
radome scanner. This optional mount is used to fit a radome scanner to a flat
surface on a mast with a minimum diameter of 60 mm (2½ in). When using the
mast mount kit, appropriate hardware should be used for the style and
structure of the mast aboard the vessel. Typically, the scanner will be mounted
near the first set of mast spreaders. If there is any doubt concerning the
appropriate type of hardware, consult your boat dealer or representative for
their recommendations.
Depending on the type of sailboat, a radar scanner guard should be installed if
the sails could touch the scanner or platform. Without a proper radar guard the
mounting platform and the radar scanner could be severely damaged.
Mounting surface: power boats
On many small vessels the scanner unit can be installed on a mast platform, an
arch, or a bridge structure, but take care to follow the scanner site guidelines,
particularly regarding height. If necessary, construct a radar mounting
platform to obtain a sufficiently high mounting position. Make sure that the
platform surface is flat and the radome scanner unit drain hole is not
obstructed. Ensure the platform is strong enough to support the maximum
shock loads likely to occur.
Setting the radiation plane
The scanner unit should be mounted so that the array rotates parallel to the
waterline. The radar beam is approximately 25° wide in the vertical direction,
providing good target detection during the vessel's pitching and rolling.