Simrad/Robertson/Stowe Dataline - calibration

[rudolph_hart]

I have one of these systems, factory fitted and driven by a Databox which is serial numbered /40 thus allowing Dataline X & Simrad IS11 displays to be mixed (which I have).

This year I replaced the Stowe speed transducer with an Airmar, which has a 'seavalve' to reduce water ingress when pulling the transducer.

It all works well, except the speed reading is quite - erm - 'optimistic', which is good for morale, but I would like it to read correctly.

I have all the relevant manuals (generously PDF-ed by other forumites), and the Fault Finding sections recommend "Calibrate the Speed Transducer (using another instrument)". Neither the SDX head, nor any of the other display heads (Wind, Nav & Central) has log speed calibration facilities in its Menu. /forums/images/graemlins/confused.gif

Has anyone successfully carried out a speed recalibration? Does it have to be performed inside the Databox itself, and if so, how?

All advice gratefully received.

 

[Stork_III]

See section 4.9.4 of SDX manual PAGE 30, which gives method to manually calibrate the Log Transducer. ie press Speed & Log buttons together for 3 sec, to get "LIte". press log 7 times to get "Cal Log". press Depth to enter value. Use Speed or Log to change value in 2.5% steps up/down.

Press * twice.

You need to idea of how over reading log is. ie motor in flat water and compare with GPS SOG.

 

[rudolph_hart]

Many thanks for that. Will give it a go this weekend.