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GETTING STARTED
Power
This unit operates from four AA batteries, or one DURACELL
®
NiMH
rechargeable battery, or from 5 to 16 volts DC using a CA-2 external
power cable (not included). If the power cable is used, the unit automati-
cally switches to it if the external power is greater than the battery voltage.
If for any reason 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
ones listed above. Do not mix different types of batteries. (For example,
don’t use both alkaline and ni-cad batteries at the same time.)
Battery Installation
First turn the unit so that its back is facing
you. Push the two tabs to the left and re-
move the battery cover as shown at right.
Install the batteries according to this dia-
gram. (There’s a decal in the battery com-
partment showing the correct polarity,
also.) Replace the battery compartment
cover and the unit is ready for use.
NiMH Battery
The DURACELL
®
DR-121 nickel-metal
hydride (NiMH) battery replaces the four
standard batteries. It is sold as an acces-
sory, model BR-1 which includes a charger
custom designed for the DR-121. The bat-
tery never needs to be removed from the
unit, since the charger connects to the GPS receiver and charges the
DR-121. You can even use the receiver while the battery is charging!
To install the NiMH battery, remove the battery cover and place the bat-
tery into the compartment as shown on the next page. It will only fit one
way, so if it’s difficult to install, simply turn it over and drop it into place.
3