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DeLorme Topo North America 9.0 User Guide
206
Grid Size Comparisons
When you use the Handheld Export tab to export maps, you can choose a grid size. A grid
of the same size gets progressively larger in coverage (square area) the closer it is to the
equator. This is because the grid system is based on the latitude/longitude coordinate
system.
60 seconds = 1 minute
60 minutes = 1 degree
A 1.5 degree grid = 9 30 minute grids, 324 5 minute grids, 8,100 1 minute grids, or
202,500 12 second grids.
A 30 minute grid = 36 5 minute grids, 900 1 minute grids, or 22,500 12 second grids.
A 5 minute grid = 25 1 minute grids or 625 12 second grids.
A 1 minute grid = 25 12 second grids.
Grid
Size
Factor # of
Grids
# of
Grids
# of
Grids
# of
Grids
Display Range
1.5
degree
9 x 30
minute
1 N/A N/A N/A 4-20
30
minute
36 x 5
minute
9 1 N/A N/A 6-20
5
minute
25 x 1
minute
324 36 1 N/A 8-20
1
minute
25 x
12
second
8,100 900 25 1 11-20
12
second
N/A 202,500 22,500 625 25 13-20
Data Zoom Level/Scale Bar Translation
Your DeLorme application and your Earthmate PN-Series GPS device use different methods
for representing the map's scale. In DeLorme Topo North America, scale is represented as a
data zoom level (1-17). The Earthmate PN-Series GPS device uses a scale bar, based on the
measurement units chosen in Device Setup.
The following table describes the correlation between data zoom levels in your DeLorme
application and the scale bars on the device.