To find the best marine gps , you have to do a lot of comparison shopping and reading about the different brands before making an informed decision. Do some comparisons , read the many opinions , and shop around a bit before his mind , which is the best marine GPS navigation for your needs. A Marine unit GPS navigation need to use at least 12 of the 24 satellites to calculate its position.All 24 would be best , of course. And a larger screen in marine software for reading and watching the water below the boat would be ideal. Some of the smaller marine units , portable or handheld GPS are not the best because the size takes away from the clarity of the image. There are several that are up to 7 “LCD touchscreen with a crystal clear what they are able to distinguish a rock from a fish when looking at the water or the bottom of the lake or the ocean.Another element to consider when hunting for the best marine GPS would be the number of alarms that have on him. Some have alarms for the day , off course , anchor drag , very shallow , deep , proximity , low battery , arrival , landmark , water temperature and the rate of temperature change and there are others , but the best marine gps with all alarms for security reasons. Along with alarms , consider the night shift and ways of sunlight many of the best marine GPS can help combat the sun’s glare on the water or to help you find your way back in the dark the night.You will have to decide whether to buy a small model of marine software , portable or pocket or a larger model type , ‘stay’ of marine GPS unit. The marine portable GPS navigation units are smaller and fit in a pocket or purse. However , some of the larger units can be removed and used in a vehicle like an RV or a car , but laptops are made for walking , hiking , biking and around the city with easy. Both styles of marine GPS receivers come with the same amount of software and options , just depends on what you prefer to be off the ship.Want to be entertained? Some marine GPS navigation unit comes with an audio voice player to play audio books , others you have to buy a subscription to something like XM radio or a weather channel , which is not a bad idea since the Weather changes quickly and I want to be on top of things when the weather starts to change.Above all , make sure that the best marine GPS unit has enough software to accommodate all you want to do , while in the boat , such as finding fish runs to avoid large amount of debris. These things can be done and avoid the kind of software available for downloading or that has already been downloaded in the marine GPS unit. Do you have to buy more antennas? Or additional cables for your computer to be compatible? These are questions you need to make you and the seller behind the counter or at the other end of the web.To find the best marine gps , you have to do a lot of comparison shopping and reading about the different brands before making an informed decision. Do some comparisons , read the many opinions , and shop around a bit before his mind , which is the best marine GPS navigation for your needs. A Marine unit GPS navigation need to use at least 12 of the 24 satellites to calculate its position.All 24 would be best , of course. And a larger screen in marine software for reading and watching the water below the boat would be ideal. Some of the smaller marine units , portable or handheld GPS are not the best because the size takes away from the clarity of the image. There are several that are up to 7 “LCD touchscreen with a crystal clear what they are able to distinguish a rock from a fish when looking at the water or the bottom of the lake or the ocean.Another element to consider when hunting for the best marine GPS would be the number of alarms that have on him. Some have alarms for the day , off course , anchor drag , very shallow , deep , proximity , low battery , arrival , landmark , water temperature and the rate of temperature change and there are others , but the best marine gps with all alarms for security reasons. Along with alarms , consider the night shift and ways of sunlight many of the best marine GPS can help combat the sun’s glare on the water or to help you find your way back in the dark the night.You will have to decide whether to buy a small model of marine software , portable or pocket or a larger model type , ‘stay’ of marine GPS unit. The marine portable GPS navigation units are smaller and fit in a pocket or purse. However , some of the larger units can be removed and used in a vehicle like an RV or a car , but laptops are made for walking , hiking , biking and around the city with easy. Both styles of marine GPS receivers come with the same amount of software and options , just depends on what you prefer to be off the ship.Want to be entertained? Some marine GPS navigation unit comes with an audio voice player to play audio books , others you have to buy a subscription to something like XM radio or a weather channel , which is not a bad idea since the Weather changes quickly and I want to be on top of things when the weather starts to change.Above all , make sure that the best marine GPS unit has enough software to accommodate all you want to do , while in the boat , such as finding fish runs to avoid large amount of debris. These things can be done and avoid the kind of software available for downloading or that has already been downloaded in the marine GPS unit. Do you have to buy more antennas? Or additional cables for your computer to be compatible? These are questions you need to make you and the seller behind the counter or at the other end of the web.