Excuse me if I'm being stupid...
I've been reading the manual targeting section of the GWX2.0 manual. Can't work out why I need to time for 3min 15sec as opposed to just 3min.
Isn't there a simpler equation that can be applied generically to any number of minutes target observation time? (ie. in SH4, if I time for 9 minutes I can do... (distance travelled by target)/9 x 60 and this gives me speed, simple)