On Tuesday, June 27, 2017 at 2:15:06 PM UTC-7, George Haeh wrote:
The waypoint files I see for my area seem to be .hnd

Any hints on how to convert that to .cup for a SeeYou Mobile user.?

I have no idea which area you fly in, or what a .hnd file is (other than an astronomy database format). Ask the people developing it what it is and why they use that format.

Get whoever is developing these files to use the Soaring Turnpoint Exchange and let it deal with format conversion. A soaring turnpoint file should be hand checked, have comments added, be massaged etc. and the Soaring Turnpoint .STX format files is really the place to do that.

Otherwise many people working with private turnpoint sets will use SeeYou and work natively in CUP and use it to save out different file formats.