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GPSMAP 400-/500-serie - gebruikershandleiding 61
Echolood gebruiken
: een groot aantal sterke retoursignalen wordt wit 
gemarkeerd.
: de minst gevoelige instelling. Alleen de sterkste retoursignalen 
worden wit gemarkeerd.
: kies  of . Hiermee wijzigt u de achtergrond van alle 
echoloodschermen, maar niet van het temperatuurlogscherm.

Druk op  als u de geavanceerde echoloodinstellingen wilt aanpassen 
terwijl het echoloodscherm wordt weergegeven.
: hiermee stopt u het schuiven van het echoloodscherm.

1. Druk op  >  terwijl een echoloodscherm wordt
weergegeven.
2. Plaats de aanwijzer met de  boven de vis of structuur die u
wilt markeren.
3. Druk op .
Druk in het gepauzeerde scherm op  >  om door te gaan met
schuiven.
: hiermee past u het bereik van de diepteschaal aan de rechterkant van het 
scherm aan (, of als u dit handmatig wilt doen, ).
: hiermee bepaalt u de gevoeligheid van de echoloodontvanger 
( of, als u deze handmatig wilt aanpassen, ). Als u meer details 
wilt zien, verhoogt u de versterking. Als het scherm onoverzichtelijk is, verlaagt 
u de versterking.
: wanneer u een transducer met dubbele frequentie gebruikt, kunt 
u bepalen hoe de frequenties op het scherm worden weergegeven (,
,, of ).
: hiermee kunt u inzoomen op een gedeelte van het volledige scherm. De 
zoominstelling is uit of standaard ingesteld op . Er zijn vier opties 
beschikbaar:
 : hiermee schakelt u het zoomen uit.
 : twee keer vergroten.
 : vier keer vergroten.
 : hiermee stelt u handmatig het bereik van het 
uitvergrote gebied in. Selecteer en gebruik vervolgens de 
 >  om het dieptebereik in te stellen voor 
het vergrote gebied. Selecteer en gebruik vervolgens de 
 >  om de vergrotingsfactor van het vergrote 
gebied te vergroten of te verkleinen.
 : vergrendelt het zoomvenster aan de bodem. 
 : hiermee geeft u het scherm Splits zoom weer (pagina 58).
(alleen beschikbaar als  is ingesteld op 
): hiermee wordt visuele ruis op het scherm (doorgaans het gevolg 
van elektrische bronnen) verminderd. Selecteer de bovenste schuifregelaar als u 
de waarde van de ruisonderdrukking handmatig wilt aanpassen. Het handmatig 
aanpassen van de hoeveelheid ruis zorgt ervoor dat het echolood nauwkeuriger 
wordt afgesteld zodat de meeste details met de minste ruis worden weergegeven.
Als  is ingesteld op  (en  op ), kunt u 
ruisonderdrukking voor elke frequentie afzonderlijk instellen.
67


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