Doesn't the VOR auto tune to the nearest available signal like on the 747?

Nope.

Have a look at page 11.20.9 in FCOMv2 under DME updating where it states "The FMC autotunes DME receivers as necessary for position updating" The autotune on the 747 is used for the same purpose. So the answer to your question is yes.

Have a look at page 11.20.9 in FCOMv2 under DME updating where it states "The FMC autotunes DME receivers as necessary for position updating" The autotune on the 747 is used for the same purpose. So the answer to your question is yes.

So you mean it should autotune?

Have a look at page 11.20.9 in FCOMv2 under DME updating where it states "The FMC autotunes DME receivers as necessary for position updating" The autotune on the 747 is used for the same purpose. So the answer to your question is yes.

Yes, but I think it's referring to the IRS and GPS systems cross checking that info against DME aids to verify it's position but not in the way the OP is asking.It will look for DME but not tune the actually nav radios on the center console and/or within the NAV/RAD page on FMS/CDU

Oops, I must have been thinking of ILS autotuning when selecting an approach...

The 747 757 767 have an auto tune where you can see the freqs on the NAV head cycle. The NG does that but you'll see that on the FMC NAV pages not on the NAV head.

Have a look at page 11.20.9 in FCOMv2 under DME updating where it states "The FMC autotunes DME receivers as necessary for position updating" The autotune on the 747 is used for the same purpose. So the answer to your question is yes.

There is a difference in the autotune implementation between the 747 and NG. In the 747, the FMS, tunes the primary nav receivers and the associated DME tranceivers simultaneously, which is why you will see the RMI needles constantly turning to point at whichever VOR/DME station is currently selected by the autotune logic.One drawback to this is that the autotune updating of the FMS position stops when the VOR recevers are manually tuned to specific VOR stations.The avionics suite on the NG is a generation newer than that found on the 747. The NG is equipped with two dual-channel DME tranceivers, each of which can track two separate DME stations at the same time. The primary channel of each DME tranceiver is locked to the DME associated with whichever VOR station is (manually) tuned by the onside NAV control head. The secondary channel of each DME tranceiver is the one which is continuously being autotuned by the FMS for position updating.The main difference insofar as the cockpit displays in the NG is concerned (in normal operation), is that you will not see the autotune DME tracking reflected on the instruments. The current VOR frequencies selected on the NAV control heads do not change, nor do the RMI bearing pointers. The only way to know which DME ground stations are currently being tracked for position updating is to bring up the appropriate page on the FMS.Since position updating on the NG does not involve the primary NAV receivers, its operation is not "visible" in the cockpit as it is in the 747.

There is a difference in the autotune implementation between the 747 and NG. In the 747, the FMS, tunes the primary nav receivers and the associated DME tranceivers simultaneously, which is why you will see the RMI needles constantly turning to point at whichever VOR/DME station is currently selected by the autotune logic.One drawback to this is that the autotune updating of the FMS position stops when the VOR recevers are manually tuned to specific VOR stations.The avionics suite on the NG is a generation newer than that found on the 747. The NG is equipped with two dual-channel DME tranceivers, each of which can track two separate DME stations at the same time. The primary channel of each DME tranceiver is locked to the DME associated with whichever VOR station is (manually) tuned by the onside NAV control head. The secondary channel of each DME tranceiver is the one which is continuously being autotuned by the FMS for position updating.The main difference insofar as the cockpit displays in the NG is concerned (in normal operation), is that you will not see the autotune DME tracking reflected on the instruments. The current VOR frequencies selected on the NAV control heads do not change, nor do the RMI bearing pointers. The only way to know which DME ground stations are currently being tracked for position updating is to bring up the appropriate page on the FMS.Since position updating on the NG does not involve the primary NAV receivers, its operation is not "visible" in the cockpit as it is in the 747.

Thanks! Just the information i was looking for.