How to take a depth sounding
Set the remaining switches according to the table below:
|Approx. depth of water||Visual-audible switch||Signal interval switch||Shoal-deep switch|
|Less than 300 fathoms||Visual||Standard||Shoal|
|Between 300 and 700 fathoms||Visual||Alternate||Shoal|
|Between 700 and 1800 fathoms||Audible||Standard||Deep|
|More than 1800 fathoms||Audible||Alternate||Deep|
Important: Echo-sounding pings are likely to be picked up by the enemy.
Do not take unnecessary risks.Return the signal interval switch to its
center position as soon as the depth has been obtained.