I know that this topic has been discussed in various places, but I have been trying to find a concise and updated summary of what my options are (in prep for an annual and downtime when installing the ADS-B option might be convenient).
Mine is a traditional steam-gauge panel in a M20R, with Garmin WAAS enabled radios/GPS. I am very rarely flying above FL180 but when I do I have to to get over some weather -- so I would like to keep the option.
What are the easiest (least downtime) and cheapest options to achieve ADS-B compliance given current or likely very-soon-to-be-available equipment? Does someone have a concise summary from recent research/work?