SUBSIM Radio Room Forums - View Single Post - TMA: auto or do-it-yourself ?

PeriscopeDepth · 07-19-05, 01:22 AM

In DW, I use auto TMA. But I'm curious about manual TMA. I do manual TMA when playing SHI, plotting from radar and the occasional periscope bearing only plot (though if it's close enough to see I normally don't bother with plotting, just visually estimate AOB and range. speed can be tricky though). It's a pretty simple process here, just plot bearing and range, account for ownship movement, and connect the dots and use simple math to get target speed after you measure his course. Then plot an intercept.

I'm assuming you guys plot with pencil and paper in DW also? Or can you do everything from the TMA screen? If you do plot with paper and are going off of sonar bearings only, do you guys mathematically determine the range (I remember seeing formulas for this before, way back in the SC forum) or guestimate? Maybe I'll give manual TMA in DW a whirl.

07-19-05, 01:22 AM	#37
PeriscopeDepth Sea Lord Join Date: Jul 2002 Location: Pacific NW Posts: 1,894 Downloads: 6 Uploads: 0	In DW, I use auto TMA. But I'm curious about manual TMA. I do manual TMA when playing SHI, plotting from radar and the occasional periscope bearing only plot (though if it's close enough to see I normally don't bother with plotting, just visually estimate AOB and range. speed can be tricky though). It's a pretty simple process here, just plot bearing and range, account for ownship movement, and connect the dots and use simple math to get target speed after you measure his course. Then plot an intercept. I'm assuming you guys plot with pencil and paper in DW also? Or can you do everything from the TMA screen? If you do plot with paper and are going off of sonar bearings only, do you guys mathematically determine the range (I remember seeing formulas for this before, way back in the SC forum) or guestimate? Maybe I'll give manual TMA in DW a whirl.