Hi Downinder ,
You are right .
For info , i've tested nav 9.400 on my GO710 , boot 5.5259 and new map europe 2gb 885.4008 on .It works ok but there is no guidance line.....Positive point is that seems to run faster than nav 9.026.It find satellites quickly.So i've reinstalled nav 9.026 awaiting a nav 9.400 with full options .

Thanks for letting me know