RD Instruments Cobra-Tac, User Manual, Page: 22 / 62

Cobra-Tac User's Guide
page 16 RD Instruments
4.2.2 Grid Navigation Mode
The GRID NAV Option is used to allow the diver to do hydrographic beach
surveys. To setup a survey, do the following.
a. Stand at your initial position.
b. Activate the training mode (see
“Training Mode,” page 13 ).
c. Start the mission by selecting GRID NAV on the NAVIGATION menu.
d. On the LANE WIDTH screen, use the
SELECT
function to choose the
width, Use the
ACCEPT
function to start the survey.
e. Pick a direction that is going to be your pretend beach and point the Co-
bra-Tac toward the beach. Select
START
to begin the survey.
f. Watch the Diver Navigation Indicator (see “Diver Navigation Indicator,”
page 24 ) – it will show the distance you swim.
g. To end the first leg, make a 90
°
turn to the left by using the Leg Direc-
tional Indicator, and then select
LEG
.
NOTE. Remember to turn 90
°
first, and then press
LEG
.
h. The Diver Navigation Indicator arrow will reset to the new direction.
Also, the Range of Leg will reset to zero.
i. As you walk the length of the Lane Width, mark an event as MAN
MADE (see “Event Marking Function,” page 26 ).
j. Turn 90
°
to the left, and then select
LEG
. Walk the length of the leg.
k. Turn 90
°
to the right, and then select
LEG
. Walk the length of the lane
Width.
l. Turn 90
°
to the right, and then select
LEG
. You should be walking in the
direction of the beach.
m. Practice navigating each leg and marking events. It may be helpful to
walk the course in a parking lot.
n. After completing the survey, select
HOME
and the Cobra-Tac

will di-
rect you to beginning of the survey (see “Home Function,” page 26 ).
o. Select
CANCEL
to stop the mission (which stops recording). Select
CANCEL
again to return to the NAVIGATION menu. Select
CANCEL
once more to return to the main menu.
p. Turn the power off to the Cobra-Tac.