GPSS options with 400A

[Dr.Dan]

Hi everybody, I'm in the steep learning curve of planning avionics upgrades.

I will most likely change to a GTN 750 and keep one of the older nav/com units.

For the time being, I would like to stay with the 400a.

I'm trying to learn what the options are to integrate modern gps nav with the navomatic.

If I keep all the steam gauges, what are the gpss options that work with the 400a? What are your experiences with DAC, Icarus SAM, others?

What about the gpss in the g500 txi? Will this work with the 400a?

Thanks for advice.

DD