A float line is designed to run from a marker or drop weight to the float on the surface of the water. The float line is an essential part of your float set up. 

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Types of float lines.

There are various types of float line materials from a simple rope to a bungee with internal shock line.

If you are just starting out, look at buying a float line that is inexpensive, durable and floats, such as the standard float line. 

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Spearfishing float lines benefit from having a solid core and an ability to stretch. A solid core is essential to ensure that in the unlikely event that your float line breaks, the dyneema core will maintain its integrity.

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Float line lengths

When considering the length of the float line to purchase, ask yourself how deep you expect to dive. Buy a float line that is only a metre or two deeper than the maximum depth you are most often to dive. This will prevent excess slack and tangling. For example, if you are only shore diving to 6 - 8 metres, you should use a float line that is 10 metres long. Another way to look at this is to use a float line that is only a metre or two longer than the maximum depth you will dive. 

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However, if you intend to dive for large pelagic fish, you would be better off purchasing a float line 20 to 30+ metres in length. This will allow the larger fish to run and have plenty of slack line to use, to prevent line snapping.

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