Vessel constructionThe construction of your vessel can have an impact on GPSperformance. For example, the proximity of heavy structuresuch as a structural bulkhead, or the interior of larger vesselsmay result in a reduced GPS signal. Before locating equipmentwith an internal GPS antenna below decks, seek professionalassistance and consider use of an external GPS antennamounted above decks.Prevailing conditionsThe weather and location of the vessel can affect the GPSperformance. Typically calm clear conditions provide for a moreaccurate GPS fix. Vessels at extreme northerly or southerlylatitudes may also receive a weaker GPS signal. GPS antennamounted below decks will be more susceptible to performanceissues related to the prevailing conditions.Viewing angle considerationsAs display contrast, color and night mode performance are allaffected by the viewing angle, Raymarine recommends youtemporarily power up the display when planning the installation,to enable you to best judge which location gives the optimumviewing angle.5.2 Mounting - New a SeriesViewing angle