So you love making your own things? HikeBuddy is an open source hiking computer dev board that can save you time. It lets you build a tracker for your outdoor needs. It has various sensors to work as a GPS tracker or weather monitor. It also has a LCD display that you can see in daylight.
HikeBuddy comes with a GPS module and a temperature, pressure and humidity sensor. It comes with Bluetooth and WiFi for adding more sensors and data transfer.