Chart Settings; Grid Lines - Lowrance Mark-4 HDI Operation Manual

Chart Settings

Controls map data used on the chart screen as well
as display settings like grid lines, waypoints, routes
and trails.
Chart Settings menu
Chart Data
Selects map data that will be used on the Chart
display (Lowrance or Navionics regional map). Go
to Navionics.com to see a full selection of available
charts.
Chart Operation | Mark-4 & Elite-4 HDI
COG Extension
A line extending from the front
of the current position icon that
estimates the time and distance
to areas in front of you.

Grid Lines

Displays base values for latitude
and longitude, making it easier to
get a general idea of your location
on the latitude/longitude scale.
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