According to an embodiment of the present invention a panel assembly includes a first display panel having a first insulation substrate, a second display panel having a second insulation substrate opposite to the first insulation substrate, and a touch sensing unit formed on a surface of the second insulation substrate not facing the first insulation substrate. The chart has depth information for the body of water, and is programmed to allow a user to select from a plurality of depths indicated on the sonar depth finder display. The device should have a compact, economical construction. The balloon and the coiled section resist movement of the indwelling catheter while still permitting natural urination. Category-conditional likelihoods for the identified features are determined using the category-conditional probability distributions for each category. The vibrations generates a humming sound that signals to the user that contact has been established.