How you draw/calculate the anchor swinging circle?

Ship’s length (Bridge GPS antenna to fwd) + (How many shackles x 27.5m)

FOR Example :
=   6 shackle on deck and (bridge GPS antenna to fwd) is indicated by L = 100m
=   6 shackle +L
=     6×27.5m +100
=    265m
=     (265/ 1854 ) nm
= 0.1431nm
=   (0.1431×10) cable  @ one NM is equal to 10 cable
=    1.431 cable

Note :
Centre of swinging circle is the point where anchor fluke touches SEABED.

Alternatively, The following is the formula used to calculate Swing Radius of a boat at anchor.:   

 Swing Radius = LOA + [ ( RODE ) 2 – ( DEPTH + FREEBOARD)2 ] 1/2

LOA:  Overall length of the boat, including any additions or extensions from the stern
RODE:  The length (line to the anchor) of the rode from the bow pulpit to the anchor.
DEPTH:  The water depth over the anchor.
FREEBOARD:  The distance from the deck at the bow pulpit to the water.

Note all measurements of length and distance must be in the same units.

AMIT KUMAR
From Marine Enclyopedia to MARINE GYAAN ACADEMY in Lucknow - Preparing YOUTH to become SEAFARERS ( for IMU-CET and various courses) From Marine Enclyopedia to MARINE GYAAN ACADEMY in Lucknow - Preparing YOUTH to become SEAFARERS ( for IMU-CET and various courses) From Marine Enclyopedia to MARINE GYAAN ACADEMY in Lucknow - Preparing YOUTH to become SEAFARERS ( for IMU-CET and various courses) From Marine Enclyopedia to MARINE GYAAN ACADEMY in Lucknow - Preparing YOUTH to become SEAFARERS ( for IMU-CET and various courses)