Hi, This is day four with this outstanding simulation and I have so far been able to fiqure out most of my problems. However, I have not been able to get the LNAV switch to activate and couple to the autopilot. Have read the documentation and checked the boards for help but so far no joy.... I have loaded all the flight plan data in the FMC and it looks like all info is good. I am not using or setting up any VNAV or speeds in the FMS. I get a display of all the data correctly in the NAV display, Magenta line, all fixes on the route, green alt capture arc and the VOR data for the next fix its DME on top of the arc. But the LNAV button will not connect to the A/P. I have to set the heading to the next fix on the mode control panel..... I have tried resetting the IRS on the ground and that has caused partial loss of all my displays...... I fly the PMDG B737NG without this problem and wondering what I am missing ..... As alway any help appreciated.... Using the box edition v1.1JayDubLian-Li Aluminum PC-60 CaseAntec 400W ATX 12V Power SupplyAMD ATHLON 64 3500+ 90nm Winchester CoreAbit AV8 - 3rd Eye VIA K8T800 Thermaltake A1172 CPU HeatsinkATi X850XT 256MB AGP with ATi 6.60 Drivers1GB Corsair DDR 3200Windows XP Home Edition SP2

I know you said you set everything up in the FMC, but from past threads, one reason LNAV won't engage is if you haven't set your dep runway on the DEP/APP screen.- John>Hi,>> This is day four with this outstanding simulation and I>have so far been able to fiqure out most of my problems.>However, I have not been able to get the LNAV switch to>activate and couple to the autopilot. Have read the>documentation and checked the boards for help but so far no>joy.... I have loaded all the flight plan data in the FMC and>it looks like all info is good. I am not using or setting up>any VNAV or speeds in the FMS. I get a display of all the data>correctly in the NAV display, Magenta line, all fixes on the>route, green alt capture arc and the VOR data for the next fix>its DME on top of the arc. But the LNAV button will not>connect to the A/P. I have to set the heading to the next fix>on the mode control panel..... I have tried resetting the IRS>on the ground and that has caused partial loss of all my>displays...... I fly the PMDG B737NG without this problem and>wondering what I am missing ..... As alway any help>appreciated.... Using the box edition v1.1>>JayDub>>Lian-Li Aluminum PC-60 Case>Antec 400W ATX 12V Power Supply>AMD ATHLON 64 3500+ 90nm Winchester Core>Abit AV8 - 3rd Eye VIA K8T800 >Thermaltake A1172 CPU Heatsink>ATi X850XT 256MB AGP with ATi 6.60 Drivers>1GB Corsair DDR 3200>Windows XP Home Edition SP2 >

John, It appears that was the problem. I don't know how I missed that but I did....... Thanks alot for the help..... JayDub