GNSS (GPS) location requirements

In addition to general guidelines concerning the location of marine electronics, there are a number of environmental factors to consider when installing equipment with an internal GNSS (GPS) receiver.

Mounting location

  • Location requirementsGPSGNSSAbove Decks (e.g. open air) mounting: Provides optimal performance. (For equipment with appropriate waterproof rating.)

  • Below Decks (e.g. enclosed space) mounting: Performance may be less effective and may require an external antenna or receiver mounted above decks.

Color

Location

1

This location provides optimal performance (above decks).

2

In this location, performance may be less effective.

3

This location is NOT recommended.

Vessel construction

The construction of your vessel can have an impact on performance. For example, the proximity of heavy structures such as a structural bulkhead, or the interior of larger vessels may result in a reduced signal. The construction materials can also have an impact. In particular, steel, aluminium or carbon surfaces can impact performance. Before locating equipment with an internal 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 performance. Typically calm clear conditions provide a more accurate position fix. Vessels at extreme northerly or southerly latitudes may also receive a weaker signal. An antenna mounted below decks will be more susceptible to performance issues related to the prevailing conditions.