CHICAGO MARINE ELECTRONICS
512 W. BELDEN # 2A
CHICAGO, ILLINOIS 60614
Tel: (773) 832-0679 Fax: 773-298-6908
www.ChicagoMarineElectronics.com
January 5, 2005
Yacht Name:
Yacht Type:
OCKAM Calibration Worksheet
Owner:
CAL Boatspeed Master Worksheet
Find a known course at least 1 mile long.
Run measured mile at slack tide and no wind.
Make sure the Boatspeed is steady before you begin.
Record the measured distance from the Trip Log.
Run #1
Run #2
Run #3
Course distance
Average of the runs
Average distance on all runs
Boatspeed correction
Present Cal Boatspeed Master reading
Set new Cal Boatspeed Master reading
CAL Boatspeed Offset Worksheet
Average Boatspeed on starboard tack:
Average Boatspeed on port tack:
Average Boatspeed:
Half difference Boatspeed:
Present Cal Boatspeed Offset reading:
Set new Cal Boatspeed Offset reading: (If Stbd tack faster, Cal should
increase; If Port tack faster, Cal should decrease)
CAL Wind Angle Offset Worksheet
Average apparent wind angle on stbd tack
Average apparent wind angle on port tack
NOTE: readings on port tack are negative
Half difference apparent wind angle
Present Cal Wind angle Offset reading
Set new Cal Wind angle Offset: (If Stbd tack wider, Cal should decrease;
If Port tack wider, Cal should increase)
CAL Upwash Worksheet
Sail upwind and record WIND DIRECTION on both tacks.
Run #1
Run #2
Run #3
Run #4
Average WIND DIRECTION on each tack
WIND DIRECTION Difference
Figure change to Cal Upwash
If Direction HEADS you when you tack, INCREASE Cal Upwash
If Direction LIFTS you when you tack (example), DECREASE Cal Upwash
Change Cal approximately 0.3° per degree of change in Wind Direction
Note sign of (d) is opposite to (c)
Present Cal Upwash
Set new Cal Upwash
Config #:
1
= a. 0.873 *
Back run
Out run
_______
_______
_______
_______
_______
_______
b.______ c.______
(b+c)/2 =d. ______
a/d=e. ______
f. ______
e•f=g. ______
a.
b.
(a+b)/2 =c.
(a-b)/2 =d.
e.
______
______
______
______
______
(d/c)+e =f. ______
a. ______
b. –_____
(a+b)/2=c. ______
d. ______
d-c =e. ______
Stbd tack
________
________
________
____
Port tack
_______
_______
_______
_______
a______
b______
a-b=c______
-0.3•c=d______
e______
d+e=f______
CHICAGO MARINE ELECTRONICS
512 W. BELDEN # 2A
CHICAGO, ILLINOIS 60614
Tel: (773) 832-0679 Fax: 773-298-6908
www.ChicagoMarineElectronics.com
January 5, 2005
CAL Windspeed Worksheet
Sail downwind at apparent wind angles of about 90°.
Record WIND DIRECTION on both jibes.
Run #1
Run #2
Run #3
Run #4
Average WIND DIRECTION on each jibe
WIND DIRECTION Difference
Figure change to Cal Windspeed
If Direction HEADS you when you jibe, DECREASE Cal Windspeed
If Direction LIFTS you when you jibe, INCREASE Cal Windspeed
Change Cal approximately 1.25% per degree of change in Wind
Direction.
Present Cal Windspeed
Set new Cal Windspeed
Stbd Jibe
Port Jibe
_______
_______
_______
_______
_______
_______
_______
_______
a______
b______
a-b=c. ______
(0.0125•c)+1=d._____
e. ______
d•e=f. ______
Final Notes
*1. Measured Distance at Chicago North Pier North East break wall 0.873 of 1 Nm.
On most boats, Cal Leeway should be set to 8.0.
Present Cal. Leeway: ______
The cal pot on the Wind Interface that is unnamed ( a white blank label) acts as “ Cal Upwash Slope ”
when Unisyn CPU software is in place, About 0.200
Present Cal. Upwash Sloop: ______
Cals entered by keyboard or Matryx display will be “remembered” by the CPU if the backup battery
is good. But, when the system is Master Reset or if the backup battery is dead, the calibrations will
be determined by “polling” the Apparent Wind and Boatspeed interfaces. The cal pots settings will
determine the calibration values used by the CPU.
After writing down your calibration values, you should manually set the interface cal pots to these
desired numbers.
Having set the interface cal pots, an accidental Master Reset won’t negatively effect the system, and
should you need to swap in a replacement CPU, a quick Master Reset will encode your boat’s
calibrations!
To perform a Master Reset, start with the CPU power switch off/lights switch on, then switch the
CPU on and immediately turn the light switch to the off position.
Thank you
Achillefs Koukas