Raymarine axiom 7 Installation Instructions Manual page 26

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Vessel construction
The construction of your vessel can have an impact on GPS performance. For example, the proximity
of heavy structures such as a structural bulkhead, or the interior of larger vessels may result in
a reduced GPS signal. The construction materials can also have an impact. In particular, steel,
aluminium or carbon surfaces can impact GPS performance. Before locating equipment with an
internal GPS antenna below decks, or on a steel, aluminium or carbon construction vessel or surface,
seek professional assistance.
Prevailing conditions
The weather and location of the vessel can affect the GPS performance. Typically calm clear
conditions provide for a more accurate GPS fix. Vessels at extreme northerly or southerly latitudes
may also receive a weaker GPS signal. GPS antenna mounted below decks will be more susceptible
to performance issues related to the prevailing conditions.
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This location provides optimal GPS performance (above decks).
In this location, GPS performance may be less effective.
This location is NOT recommended for GPS antenna.