This is the bonus cache to the lab cache - Wonderful Island Kefalonia - First Lab - Argostoli. To solve the lab cache you have to download the "Adventure Lab" app from Groundspeak Inc.
The listing coordinates are purely fictitious. Nothing is hidden there. The hiding place can be found with the task in the listing.
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After your walk through Argostoli (approximately 8 km), you can start out to find the bonus cache.
This is located at a somehow hidden sight.
An employee has been informed about the bonus cache.
A very friendly local - who takes care of the maintenance - made it possible to hide the cache at all. We will remember an island that we really like a lot and from which we took so many wonderful impressions home with us.
Good luck with searching.
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Update - 13.07.2022
The beautifully designed wooden box has now unfortunately disappeared and we are moving on to a simple version. Many thanks to ANNI181 for the deposited replacement.
Due to the replacement of the iron cover on the De-Bosset-Bridge - the calculation for the bonus has now also been changed accordingly:
Solve the task:
N 38° (C) . (D x E - (E - B)) / B
E 20° (A + B + 2) . (E² * C + C)