Just because you *can* do something doesn't necessarily mean that you
*should*.

Despite the no pen and paper thing, during my last 6 years of towing
(I'm retired now), it was a simple matter of picking up the clipboard
and recording the name of the pilot and number of the glider and then
recording the release altitude. I don't know of anyone not being billed
in all that time. There's no need for take off and landing times of the
tug.

On 3/7/2016 1:07 PM, JS wrote:
Sorry. While the OP gave a lower limit of no pen and paper, the upper limit of no FLARM was not mentioned.
I'd still use dedicated equipment even if disinterested in the five-lettered thingy. Using personal smart phones seems flawed. For example make sure other networks are not going to grab the wing runner's phone when the towplane is out of range. The significant other of the wing runner bringing lunch, or the wing runner's own logger being turned on could be that network.
Jim

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Dan, 5J