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Displaying and erasing past positions
To display past positions;
1. Press the [PLOT MENU] and [0] key to display the ARPA 2 menu.
[ARPA 2]
1 [ARPA 1]
2 TRIAL MODE STATIC/DYNAMIC
3 HISTORY OFF/1/2
4 HISTORY POINTS 5/10/20
5 HISTORY INTVL 30S/1/2/3/6MIN
6 MARK SIZE STD/LARGE
7 GUARD, ACQUISITION STABILIZE NORTH/CRT
8 INPUT SIG CHECK
9 ARPA TRACK TEST
0 ARPA INITIAL SETTING
2. Press [3] key twice to select HISTORY ON.
3. Press the ENTER key followed by the PLOT MENU key.
The label HISTORY appears at the upper-right corner of the screen.
To erase past positions; press the [3] key twice on the ARPA 2 menu.
Selecting the number of dots and past position plot intervals
1. Press the PLOT MENU and [0] key to show the ARPA 2 menu.
2. Press the [4] key to select menu item HISTORY POINTS.
3. Further press the [4] key to select a desired number of past positions (5, 10 or 20). The
IMO-type has the selection of only 5 or 10.
4. Press the ENTER key to confirm your selection.
5. Press the [5] key to select menu item HISTORY INTERVAL.
6. Further press the [5] key to select a desired past position plot interval (0.5, 1, 2, 3 or 6
minutes).
7. Press the ENTER key to conclude your selection.
8. Press the PLOT MENU key to close the menu.
2.12 Set and Drift (Set and Rate)
Set, the direction in which a water current flows, can be manually entered in 0.1-degree steps.
Drift, in another word Rate, the speed of tide, can also be entered manually in 0.1 knot steps.