8
TAC-200D Revision 5
•
DIVE MODE
The unit will enter
DIVE MODE
upon
registering an increase of approximately
1 meter of sea water. While in
DIVE
MODE
it is not possible to hibernate the
unit. A single press of the A-Button will
register nothing.
B-Button Hold will toggle between the current depth and maximum
depth obtained during the dive. The MAX Status LED will illuminate.
Dive Timing functions are not affected. A-Button and B-Button To-
gether will switch the unit from
DIVE MODE
to
STOPWATCH MODE
.
Upon re-entering
DIVE MODE
the overall
dive duration will be shown.
•
STOPWATCH MODE
A-Button Long Hold = Reset / Lap Func-
tion
B-Button Press = Start / Stop Stopwatch
•
SURFACE MODE
The unit will enter
SURFACE MODE
either when awakening from
HI-
BERNATION MODE
or when connected to the battery charger.
On first use the unit will commence a surface timer. If the unit has
been under pressure in the past 24 hours it will show the current sur-
face interval.
FUNCTIONS:
A-Button Long Press will switch the unit from
SURFACE MODE
to
HIBERNATION MODE
B-Button Hold will display the maximum
depth and duration of the last dive per-
formed.
A-Button and B-Button Together will switch
the unit from
SURFACE MODE
to
STOP-
WATCH MODE
.
TAC-200D Revision 5
5
USING THE TAC-200D DIVER
NAVIGATION BOARD
Navigating with the TAC-200D is simple once you understand the
principle “elapsed time” as a method of underwater navigation. The
key to using “elapsed time” is knowing how long it takes to swim a
known distance in a set frame of time. For example, if you consis-
tently travel 30 ft.(10M) in 20 seconds, then you can estimate the dis-
tance you travel by timing the length of your swim over a given com-
pass heading. To be fairly accurate, you must set this “benchmark”
by swimming at a normal relaxed pace.
Once you have established this “benchmark”, the TAC-200D allows
you to plot and follow a predetermined pattern or course for your dive
instead of randomly swimming around. To understand how to plot a
course, you must understand how the components of the TAC -200D
work together.
Depth and time are tracked on the DG100 depth gauge and timer.
Course heading is monitored by the large underwater compass
mounted in the center of the TAC200-1 navigation board. The com-
pass card has white luminous digits on a black background for better
contrast in poor visibility, and the three compass rose points, North,
East, and West, are highlighted.
Now let’s plot a dive to see how the TAC-200D really works. We are
able to cover a distance of 30 ft. (10m) in 20 seconds, which is our
benchmark. Using this benchmark, let’s plot a dive to a reef that is
located north of the shoreline, 270 ft.(82m) offshore in 40 ft. (12m) of
water. In planning this dive, we will explore the reef in a westerly di-
rection and then return to our entry point.
For the first leg of the dive we will plot a course along a heading of 0°
north for 3 minutes. We should cover a distance of 270 ft. and be on
the reef. Now for leg 2, we will plot a course on a heading of 270°
west for 10 minutes. This means we cover a distance of 900 ft. while
exploring the reef. At the end of leg 2, it’s time to start planning our
return to the entry point. But first, let’s plan on exploiting the area be-
tween the reef and shoreline. To do this, we plot our next course
heading for leg 3 on a heading of 180° south for 1 minute. This
means we will transverse 90 ft (27m) along the bottom toward the
shore. Here, we will turn to a heading of 90° east for 10 minutes
which places us back in the middle of leg 1. Now, all we do is turn to
a heading of 180° south and head for shore.