Thanks John,

The slightly misaligned TAS is noted and agreed on the manual ... it is not great to say the least.

When you say "clones" is there a better device to get?

My logic is simply that I started with placing the 186 heading T (given) on TC and then added 11 degrees based on the 11 degrees crab angle obtained (19 kt right cross wind) which is 186 + 11 = 197 degrees T

Thanks for your help

When you say "clones" is there a better device to get?

First, does yours have a problem ? On the calc side, line up the outer scales (C/D scales) so that 10 is against 10. Read around. All the various numbers should be aligned similarly. Then set, say 10 against 20. Read around. All the various numbers should be aligned in the ratio 2:1, so 10 is against 20, 20 is against 40 and so on. The extent to which there is misalignment indicates the extent of any manufacturing problems. The same needs to be done with the look up table cutouts but that gets a bit involved. Similarly, on the nav side one can set the TAS symbol against the 10 (this is the same as 10 against 10 on the other side) and check a few sine and cosine values around the scales. Probably a bit involved for most. Unless the misalignment is significant, probably all is OK as we are looking at the device being reasonably fit for purpose rather than being an accurate slide rule such as we had in previous years at a greater cost of ownership.

My logic is simply that I started with placing the 186 heading T (given) on TC and then added 11 degrees based on the 11 degrees crab angle obtained (19 kt right cross wind) which is 186 + 11 = 197 degrees T

Was not the 186 value your track, rather than heading ? What does the TC stand for ? What is the significance of your 197 ? Perhaps have a quick revisit of the calculations ?