Custom OFFLINE elevation service

Hi,

in Oruxmaps there exists a "custom online elevation service" which is very nice. On thing I don't like about it is that you have to be online which sometimes is not possible i.e. if you have no connection to a mobile phone cell which can happen quite often during your outdoor activities. So it would be very useful if the elevation service feature could be used offline. The idea is to do it like the "High Altitude"-App is doing it. You just need to save the famous srtm-files on your mobile and then the elevation is calculated onboard depending on your x- and y-coordinates using the srtm data saved on the mobile.

High Altitude App:
https://play.google.com/store/apps/details?id=com.duerr.ha&hl=de

Thank you very much and best regards,
Hans