MapSource Roads &
Recreation CD Maps Compared with Lowrance CityStreet Maps
(10 Feb. 1999)
City map views compared
________
R&R
GM-100
R&R
GM-100
R&R
GM-100
The above picture pairs are in the North Atlanta area just South of Sandy
Springs. The R&R and GM-100 pictures are screen dumps using G7to(w).
All of the pictures are done using user-uploaded maps from CD. The
R&R pictures are screen dumps of the Garmin G-III+ and the GM-100 pictures
are using the Lowrance CityStreets CD maps. Both GPS receivers are
adjusted for the highest map resolution and detail available in all pictures.
Obviously, one might wish to reduce the map resolution in both units
for the larger scale maps.
The R&R maps puts somewhat more *road* detail (vectors per curve)
on maps as compared with the GM-100, but the GM-100 has more water features.
If you place the pointer on a small residential street, the G-III+
will put a name on the street *most of the time* without having to zoom
in to see it. (The GM-100 does not have this ability).
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Rural Road Views from Garmin R&R and Lowrance CityStreets,
Compared
________
R&R
GM100
R&R
GM100
R&R
GM-100
The above rural map views compare the quality of the maps from the
R&R and the GM100. Generally, both maps include the same
rural roads and BOTH are quite complete. The R&R maps are a bit
newer (at least in the Atlanta area). For instance, in the
above maps, the R&R MapSource maps show AC Smith Road (correct
name) whereas the GM100 calls the same road Silver City Road (name before
1993). In some instances, R&R shows a road
not on GM-100 and in other instances, the reverse is true so neither
map is perfect and if history is a true guide, accuracy in both will
vary from area to area.
Other Typical Comparison Views
Inland (navigable) Lake Chickamauga (Chattanooga, Tennessee)
Showing Mile Marker, Marina, and State Park Icons:
*
R&R
GM100
R&R
GM-100
The below are example comparisons of the Garmin WorldMap (with nav aids)
to the Lowrance WorldMap
*
Garmin
Lowrance
Garmin
Lowrance
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ADDITIONAL WORLD MAPS ARE SHOWN BELOW
NOTE: There is a
2.5:1 ratio (below) between the mileage scale of the GM100 and the km scale
of the Garmin:
Lowrance GM100 WorldMap CDROM (Uploadable Map)
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Garmin G-III International ( Internal BASE) Map
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Garmin G-III+ MapSource World Map (Madrid Area)
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See additional examples of WorldMap
and Nautical Nav Aids screens HERE
Joe and Jack