Temperature measurements using a lab alcohol thermometer were compared to the temperature measurements taken using Sherwood Wisdom dive computers. This calibration confirmed that the Sherwood computers consistently read 4 degrees F lower than actual temperature. Since previous posts to iNaturalist have used raw measurements from the Sherwood computers, to maintain consistency all future posts on iNaturalist will also use the measurements as taken using the Sherwood computers. Therefore, to find the actual temperature, it is necessary to add four degrees F to the measurement in a post.