p style=" margin-top: 36pt; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt;
text-align: center; text-indent: 0pt; line-height: 71pt;">Set & Drift

Capt. Dan ASA 105

Two situations

Known start point and known fix
Known set and drift

Calculating Set/Drift

Plot Dead Reckoning

0815

0945

Calculating Set/Drift

At 0850 you get a good 2-LOP fix

You plot your position
And you plot your DR position for the same time

Calculating Set/Drift

Plot fix

0815

0945

X

0850

Plot DR for fix time

0850

Calculating Set/Drift

0815

0945

X

0850

0850

Measure the heading (True) from DR pt to Fix

190º T

Thats the set - 190º T

Calculating Set/Drift

0815

0945

X

0850

0850

Measure the distance from DR to Fix

.85 nm

Calculating Set/Drift

0815

0945

X

0850

0850

Calculate the speed

0815 to 0850 = 35 min

60x.85nm

Speed*35 min

=

51

Speed*35 min

=

1.47

Review