I use UTM on land, and lat/lon when at sea. The marine charts I have seen have only lat/lon on them, while USGS charts of recent vintage have the nice UTM grid overlay. Older USGS products have the UTM tick marks on the map margins, so you can draw the grid if you like. Only very old USGS maps (vintage WWII) lack the UTM grid. It is standard practice in North American archeology to record site locations using UTM, so this has influenced me rather strongly.<br><br>But basically, I navigate by keeping my eyes open and paying attention to my surroundings.