ASA 105 Navigation 2022- QUESTIONS AND ANSWERS
1. DR dead reckoning; based on direction (bearing) and
distance
2. LOP Line of Position; a single bearing taken. Used when
doing fixes.
3. Running Fix Determines my position by two bearings taken at
DIFFERENT times, for example 15 or 30 minutes
apart. The bearings can be to the same mark or to
different marks. The first fix is advanced along the
DR course line for the distance traveled in the time
between the two bearings. Where the two bearings
cross is the Running Fix.
4. Turn Bearings On DR course use a pre planned bearing to an ob-
ject ob land to waymark where to turn in different
direction. Can be done in advance.
5. Dipping a light When approaching a major lighthouse from a dis-
tance, in the beginning flashes on/off due to curva-
ture of earth, as soon as visible all the time you know
you are now in range of that light: look up the table
number for that lights and yourself, add together,
that tells you how far away the light is in nm. Take
a bearing to the light and plot the distance on that
LOP. Thats your position.
6. Danger bearing Using Land marks plot in advance danger bearings
to stay away from reefs etc.
1/4
1. DR dead reckoning; based on direction (bearing) and
distance
2. LOP Line of Position; a single bearing taken. Used when
doing fixes.
3. Running Fix Determines my position by two bearings taken at
DIFFERENT times, for example 15 or 30 minutes
apart. The bearings can be to the same mark or to
different marks. The first fix is advanced along the
DR course line for the distance traveled in the time
between the two bearings. Where the two bearings
cross is the Running Fix.
4. Turn Bearings On DR course use a pre planned bearing to an ob-
ject ob land to waymark where to turn in different
direction. Can be done in advance.
5. Dipping a light When approaching a major lighthouse from a dis-
tance, in the beginning flashes on/off due to curva-
ture of earth, as soon as visible all the time you know
you are now in range of that light: look up the table
number for that lights and yourself, add together,
that tells you how far away the light is in nm. Take
a bearing to the light and plot the distance on that
LOP. Thats your position.
6. Danger bearing Using Land marks plot in advance danger bearings
to stay away from reefs etc.
1/4
