Hi jd
There are ‘3 Bearing Types.’
1. True
2. Hydro
3. Scope
4. A ‘True Bearing’ always faces ‘N’ (North) ‘0’ or ‘360’ degrees
5. This type of Bearing is used for ‘Map Work’ and ‘Setting Headings’
6. The ‘Hydro’ and ‘Scope Bearing’ ‘Start’ at ‘0’ and ‘End’ at ‘360’ degrees at the ‘U-Boats Bow.’
7. Any Bearing information that you receive from your ‘Crew’ will be this type.
8. The ‘Radio Man’ will give both ‘True’ and ‘Scope Bearings.’
9. The ‘Navigator’ will give ‘True Bearings’
Example.
If we are heading ‘90 degrees ‘East’ ‘True’ and receive information from the ‘Sonar Man’ saying there is a ‘Contact’ at ‘350 degrees’ we must convert this to a ‘True Bearing’ before it can be plotted on our ‘Navigation Map.’
To ‘Convert’ to a ‘True Bearing’ we must add the ‘U-Boats Bearing’ ’90 degrees’ plus the ‘350 degrees Contacts Bearing.’
If the ‘Total’ passes ‘360 degrees’ we start again from ‘0’
The ‘Calculation’ is ‘350 + 90 = 440 – 360 = 80 degrees.’
Once you have the true bearing 80 degrees you can plot it on the map and adjust your course to intercept.
Peter
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