trek download

Those formats are those that are used for the different map programs eg Oziexplorer, Hema, Garmin etc. Oziexplorer can import GPX and convert to Ozi format.
What map program are you using? This will help in guiding you as to what format you should download.

thanks for the information so far. The ipad is an air2 64gb gps, cellular with Hema and Mud maps installed by my sil. We both had a look at downloading a trek file but came up the, which of 6 formats do you require for the download and we both looked at each other and said wtf. He has now dumped it on me (techno idiot) to source the info required so he can show me how download the trek file, hence the question. Yes, my sil does have an iTunes account to use if I need to go there for the download. We both didn't understand what all the different formats were for. I am only assuming apple and android are 2 different systems, even though you can run the same eg hema,mud maps programs on both, the format for each will be different.
I have read various threads where members are using ipad doing exactly what I would like to achieve, hence starting this thread to get a better understanding on what and how to do things. I shall speak to my sil tonight and get him to try the GPX format as David/Michelle has advised. Any other input will still be appreciated.

thanks GarryR ..... (techno idiot)