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DGPS - What is it?
If you want better performance, (and who doesn’t?) many manufacturers
(including Lowrance) sell a DGPS receiver that attaches to your GPS
receiver. The DGPS system transmits correction signals that increase the
accuracy of your unit. The DGPS receiver takes signals from these land-
based transmitters and gives them to the GPS receiver which then uses
them to show a more accurate position. (You can use the signals from all
of the Coast Guard DGPS stations for free, by the way.) The downside to
this is it requires another piece of electronic gear (the DGPS receiver)
which usually isn’t small enough to carry with you, but will work nicely on
a vehicle. And you have to be close enough to a station to receive the
DGPS signals.
Don’t Get Lost
Generally, you find that using your GPS receiver without DGPS is both
easy and amazingly accurate. It’s easily the most accurate method of
electronic navigation available to the general public today. Remember,
however, that this receiver is only a tool. Always have another method of
navigation available, such as a chart or map and a compass. It’s a good
idea to carry spare batteries with you, especially if you’re venturing into
unknown territory.
Also remember that this unit will always show navigation information in
the shortest line from your present position to a waypoint, regardless of
terrain! It only calculates position, it can’t know what’s between you and
your camp, for example. It’s up to you to safely navigate around obstacles,
no matter how you’re using this product.
GETTING STARTED
Power
The GlobalMap 100 operates from AA batteries or from 5 to 35 volts DC
using an optional external power cable. If the power cable is used, the
GlobalMap 100 automatically switches to it if the external power is greater
than the battery voltage. If the external power fails, the unit automatically
switches to the batteries.
BATTERIES
The unit requires four AA batteries. We recommend you use alkaline bat-
teries for the best trade-off between battery life and cost. However, you
can use nickel-cadmium (ni-cad), or lithium batteries. You can also use
rechargeable alkaline batteries such as RayOVac
®
Renewals
®
. With the
exception of lithium, none of the above batteries will last as long as stan-
dard alkaline batteries. We recommend DURACELL
®
brand, but others
will work. Do not use “heavy-duty” batteries or any type other than the