Track-The Proximo App dashboard keeps track of up to five items, including a customizable active proximity meter, so you always know how far away you are from them.

ENGADGET: Kensington wants you to be very afraid of losing your iPhone, buy its $60 Proximo system

The 2, 869-meter-tall volcano, which last erupted in May, is one of the most active in Kamchatka, the agency said.

BBC: Volcano erupts in Russian Far East