Furuno GP-1600F - Manual (Page 46)

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Changing mark shape
You may select the shape of marks on the TRACK/MARK SETUP
menu.
1) Press the [MENU ESC] key.
2) Press the [2] key to select TRACK/MARK SETUP.
3) Operating the [Arrow] keys, select MARK SHAPE and shape
desired.
4) Press the [MENU ESC] key.
2.19 Erasing Marks
Marks can be erased individually or collectively. How to erase
marks collectively will be discussed later.
1) Press the [CURS] key to turn on the cursor.
2) Operate the [Arrow] keys to place the cursor on the mark to
erase.
3) Press the [CLR] key.
2.20 Connecting Marks
Marks can be connected with solid or dashed lines. This feature is
useful for denoting important areas.
1) Press the [MENU ESC] key.
2) Press the [2] key to select TRACK/MARK SETUP.
3) Operate the [Arrow] keys to select LINE TYPE to other than
"single dot."
4) Press the [MENU ESC] key.
5) Press the [CURS] key to turn on the cursor.
7) Press the [Arrow] keys to place the cursor on location desired
for mark.
8) Press the [EVENT MOB] key.
9) Repeat steps 7 and 8 to continue entering and connecting marks.