# Tools and Calculators

### Boat Speed Calculator

Most of us want to know our boatâ€™s top speed but donâ€™t know how to calculate it. And, just as likely, we donâ€™t think we need to. GPS is a good way to figure out your boat speed with no effort. It does all the work for you with just a glance. But itâ€™s not…

### Boat Distance Calculator

There are three important parts to planning any trip on a boat when it comes to the journey itself. How fast are you going, how long itâ€™s going to take and how far are you going? Youâ€™ll never know when youâ€™re going to arrive somewhere without those numbers. We have a handy boat speed calculator…

### How Water Pressure Works: Water Pressure Calculator Included

Most of us know that the deeper you go under water, the greater the pressure. This is why divers need to be careful as they come back up from deep dives. The nitrogen that has built up in their bodies needs time to dissipate. If this doesnâ€™t happen, it expands too quickly. This gives rise…

### TVMDC Explained

TVMDC is a kind of acronym known as a mnemonic initialism. It’s an easy to remember abbreviation word. That means each letter in the acronym stands for the first word in a longer term. It stands for true heading, variation, magnetic heading, deviation, compass heading. Sometimes it will be called true variation magnetic deviation…

### Distance, Speed, Time Worksheet

Coastal Navigation Course Chapter VI Distance, Speed, Time Worksheet Remember: Convert Minutes to Decimals (and back) and Round Answers Distance: Speed: Time: 1. 15.0 nm 8.6 1 hour 45 minutes = 1.75 hours Calculation:Â D Ã· T = S – 15.0 nm Ã· 1.75 hours = 8.57 kts 2. 12.5 nm 7 kts 1 hour 47…

### Search MIC Database

You may remember reading in a past tip that the first three letters of the Hull Identification Number are a three letter code that identifies the manufacturer. To decipher the code and determine the manufacturer of a boat,Ã‚ click on the link “USCG Manuf. ID Code (MIC)” and you will find a page similar to…

### How to use dividers

Navigation Tools How to use dividers Using dividers and the latitude scale on your nautical chart, you are able to measure distance in nautical miles. (Remember, do not use longitudes to measure distance. Longitude lines converge at the poles and the distance between them changes relative to your position on the earth.) One minute equals…

### How to use parallel rulers

How to use parallel rulers Parallel rulers are used to plot direction on your nautical chart. They are, essentially, two straight-edges hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non-moving edge, you can move the rulers about the chart while still maintaining the same angle….

### Swap Fathoms to Feet with Our Quick Conversion Calculator

Do you know how many feet are in a fathom? Our fathoms to feet calculator makes the conversion quick and easy. Convert Fathoms to Feet with Our Calculator The calculator is very straightforward. Simply type in the number of fathoms in the first calculator or feet in the second to convert from one to the…

### Nautical And Statute Mile Calculator And Conversions

Statute Miles vs. Nautical Miles How to convert nautical miles to miles and miles to nautical miles: A statute mile is 5,280 feet in length. A nautical mile is 6,076.11549â€¦ feet in length.   To convert from statute to nautical miles a factor of 1.15 is generally used, even though it is not precise. (5,280…

### CHART SCALES

A nautical chart is far more in depth than a standard map. Nautical charts contain a lot of useful information. A typical map may just show you the distance from one place to another. Nautical maps and charts use NOAA data to show much more than distance. Whether theyâ€™re paper charts or electronic, they offer…

### Hull Speed Calculator and Waterline Length

Waterline length is the length of the boat from bow to stern where it sits in the water. In other words, as it floats in the water, if you were to mark the point on the bow where the water touched and marked the point on the stern where the water touched and then…

### Knots to Miles Per Hour: Understanding Boat Speed

One of the hardest things for new boaters to understand is speed on the water. Weâ€™re very used to miles per hour on land. But on the water there are nautical miles and knots. How and why are they different? Letâ€™s take a look. Calculating Knots to Miles Per Hour One knot equals roughly…