I have been trying to use Chart Navigator Pro offline (without it connected to my GPS) to plot routes etc. the problem is it runs really slow to the point it is unusable. I have a Garmin GPS 152 device coonected to my laptop via a serial to USB adapter on COM7. when i open Chart Navigator without the GPS plugged in it it says cannot find COM7 do you want Chart Navigator Pro to stop trying to use it? I get two options Yes or No. i have tried both and still no joy. Any ideas? Thanks