I have burned the RNS-E 2011 on 2 DVD+R DL and got no error message when burning. When I put the DVD in to the navigation I've got the message "place dvd"
What is going wrong here? The dvd was already in the navigationplayer.

I am no expert in this, but I see 2 possiblities:

One

It's possible your navigation DVD reader is broken - that means you should change the lens, or the RNS-E.

Two

I believe there should be a list of "recommended writers" supplied in the downloaded. These I think :

[Asus]
DRW-1814BLT // [FW: 1.14]
[Pioneer]
DVR 108 DB | FW: PioData DVR-108DX FW118EU
109
110 | Firmware: 1.39
111D | Firmware: 1.29 seems crucial
112D | Firmware: 1.09
112BK | Firmware: 112L
115
115D
116D
DVR-A09XLB | Firmware: 1.59
212D | Firmware: 1.21
DVR-216D | (FW: 1.09)
DVR-216DBK | (FW: 1.09)
DVR-216L | (FW: 1.09)
[LITE-ON]
LH-20A1L | FW: BL06
DH20A3S
[Plextor]
PX-880SA
PX-L890SA
[****]
BD-CMB UJ-120 | FW: 1.00
[Optiarc]
AD-5680H | FW: 3AHB

This list is there for a reason ! When your burner is not on that list, there is no guarantee the DVD will be recognized.
Also Verbatim DVD+R DL DVD are recommended.

As to burning software, Alcohol120% and Imgburn seem to give good results. Burn at a low speed !!!

Hello,
Where have you downloaded RNS-E 2011 .cdr ??

Hello,
I've downloaded the RNS-E 2011 by the piratenbay.org

you must use a specified burner with firmware and a +RDL preferably verbatim and make sure the book type is set to DVD ROM